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style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1985/">1985</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1986/">1986</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1987/">1987</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1988/">1988</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1989/">1989</a><a 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href="/archive/issues/1994/">1994</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1995/">1995</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1996/">1996</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1997/">1997</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1998/">1998</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1999/">1999</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2000/">2000</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2001/">2001</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2002/">2002</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2003/">2003</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2004/">2004</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2005/">2005</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2006/">2006</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2007/">2007</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2008/">2008</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2009/">2009</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2010/">2010</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2011/">2011</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2012/">2012</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2013/">2013</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2014/">2014</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2015/">2015</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2016/">2016</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2017/">2017</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2018/">2018</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2019/">2019</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2020/">2020</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2021/">2021</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2022/">2022</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2023/">2023</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2024/">2024</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2025/">2025</a></div></div></div><div class="issue__list-8JHD2"><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/12-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/491908EE-28E1-4246-84DECCB1382A5C9F_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2292supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/491908EE-28E1-4246-84DECCB1382A5C9F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/491908EE-28E1-4246-84DECCB1382A5C9F_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-12-27">December 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/12-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5CB37290-DCC7-42AF-BE8204BD42BCB8BC_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 26" srcSet="https://static.scientificamerican.com/sciam/cache/file/5CB37290-DCC7-42AF-BE8204BD42BCB8BC_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/5CB37290-DCC7-42AF-BE8204BD42BCB8BC_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-12-27">December 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/12-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/88EA798B-0138-48A9-83BEF1CF875538A1_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2291supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/88EA798B-0138-48A9-83BEF1CF875538A1_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/88EA798B-0138-48A9-83BEF1CF875538A1_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-12-20">December 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/12-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B0693930-5477-45A6-99D8E8816ECBE775_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 25" srcSet="https://static.scientificamerican.com/sciam/cache/file/B0693930-5477-45A6-99D8E8816ECBE775_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B0693930-5477-45A6-99D8E8816ECBE775_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-12-20">December 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/12-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/57179A91-43F3-41A1-86816692B4731547_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2290supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/57179A91-43F3-41A1-86816692B4731547_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/57179A91-43F3-41A1-86816692B4731547_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-12-13">December 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/12-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B6C15837-5FA1-4F0D-B8922B7BAA91C96E_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 24" srcSet="https://static.scientificamerican.com/sciam/cache/file/B6C15837-5FA1-4F0D-B8922B7BAA91C96E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B6C15837-5FA1-4F0D-B8922B7BAA91C96E_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-12-13">December 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/12-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/912C6822-91DA-4828-9F59739AEFFBD5C6_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2289supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/912C6822-91DA-4828-9F59739AEFFBD5C6_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/912C6822-91DA-4828-9F59739AEFFBD5C6_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-12-06">December 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/12-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BA0727CF-F6AA-45E2-9422085F700A4550_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 23" srcSet="https://static.scientificamerican.com/sciam/cache/file/BA0727CF-F6AA-45E2-9422085F700A4550_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BA0727CF-F6AA-45E2-9422085F700A4550_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-12-06">December 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/11-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BD41BD66-472C-4116-B56AF0631D351E16_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 22" srcSet="https://static.scientificamerican.com/sciam/cache/file/BD41BD66-472C-4116-B56AF0631D351E16_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BD41BD66-472C-4116-B56AF0631D351E16_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-11-29">November 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/11-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/66D020A7-5D37-48E8-9835A986736CF4D3_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2288supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/66D020A7-5D37-48E8-9835A986736CF4D3_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/66D020A7-5D37-48E8-9835A986736CF4D3_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-11-29">November 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/11-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FB4063F4-69BD-4F09-9178DC3243B00358_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2287supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/FB4063F4-69BD-4F09-9178DC3243B00358_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FB4063F4-69BD-4F09-9178DC3243B00358_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-11-22">November 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/11-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D5892FC5-CFF9-40D5-B02E6FFBC6729C6D_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 21" srcSet="https://static.scientificamerican.com/sciam/cache/file/D5892FC5-CFF9-40D5-B02E6FFBC6729C6D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D5892FC5-CFF9-40D5-B02E6FFBC6729C6D_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-11-22">November 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/11-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A3729E3C-F59D-4B90-A6998ABAD5B2D1A7_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2286supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A3729E3C-F59D-4B90-A6998ABAD5B2D1A7_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A3729E3C-F59D-4B90-A6998ABAD5B2D1A7_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-11-15">November 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/11-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B705FEB6-88C6-4DB2-B2E3442C1B89B830_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 20" srcSet="https://static.scientificamerican.com/sciam/cache/file/B705FEB6-88C6-4DB2-B2E3442C1B89B830_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B705FEB6-88C6-4DB2-B2E3442C1B89B830_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-11-15">November 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/11-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/DEECFB46-3F0F-4F90-807561A327F52219_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2285supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/DEECFB46-3F0F-4F90-807561A327F52219_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/DEECFB46-3F0F-4F90-807561A327F52219_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-11-08">November 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/11-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9B28D259-1848-400D-A77F22D3F6725971_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 19" srcSet="https://static.scientificamerican.com/sciam/cache/file/9B28D259-1848-400D-A77F22D3F6725971_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9B28D259-1848-400D-A77F22D3F6725971_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-11-08">November 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/72810E5A-C8B4-4ECD-BE8CE41AA5D1927A_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 18" srcSet="https://static.scientificamerican.com/sciam/cache/file/72810E5A-C8B4-4ECD-BE8CE41AA5D1927A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/72810E5A-C8B4-4ECD-BE8CE41AA5D1927A_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-11-01">November 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/10-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/04BDB3E2-A053-49C8-91AC96E216E22034_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2284supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/04BDB3E2-A053-49C8-91AC96E216E22034_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/04BDB3E2-A053-49C8-91AC96E216E22034_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-10-25">October 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/10-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8C9299B7-89C8-4101-8D5558D9E1716400_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 17" srcSet="https://static.scientificamerican.com/sciam/cache/file/8C9299B7-89C8-4101-8D5558D9E1716400_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8C9299B7-89C8-4101-8D5558D9E1716400_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-10-25">October 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/10-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6C705601-68EC-45CD-AD53732ED7ADB5E8_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 16" srcSet="https://static.scientificamerican.com/sciam/cache/file/6C705601-68EC-45CD-AD53732ED7ADB5E8_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6C705601-68EC-45CD-AD53732ED7ADB5E8_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-10-18">October 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/10-11/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/77D036DB-F0FA-4912-94CAE2D5EB902746_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2283supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/77D036DB-F0FA-4912-94CAE2D5EB902746_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/77D036DB-F0FA-4912-94CAE2D5EB902746_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-10-11">October 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/10-11/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A8AAD4E6-5C0B-4C98-B5073BC15BEE6930_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 15" srcSet="https://static.scientificamerican.com/sciam/cache/file/A8AAD4E6-5C0B-4C98-B5073BC15BEE6930_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A8AAD4E6-5C0B-4C98-B5073BC15BEE6930_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-10-11">October 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/10-04/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/AF56ABF2-4867-4175-A9F26B418F8A09D0_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 14" srcSet="https://static.scientificamerican.com/sciam/cache/file/AF56ABF2-4867-4175-A9F26B418F8A09D0_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/AF56ABF2-4867-4175-A9F26B418F8A09D0_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-10-04">October 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/09-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/893507CB-E9A0-4D12-B97A2650CE72A053_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2282supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/893507CB-E9A0-4D12-B97A2650CE72A053_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/893507CB-E9A0-4D12-B97A2650CE72A053_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-09-27">September 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/09-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/38433BB6-2FDB-45AB-8B43A6015CFAFFE6_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 13" srcSet="https://static.scientificamerican.com/sciam/cache/file/38433BB6-2FDB-45AB-8B43A6015CFAFFE6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/38433BB6-2FDB-45AB-8B43A6015CFAFFE6_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-09-27">September 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/09-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CA9DD6E0-5C03-459C-BFD80F2B8905E790_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2281supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/CA9DD6E0-5C03-459C-BFD80F2B8905E790_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CA9DD6E0-5C03-459C-BFD80F2B8905E790_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-09-20">September 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/09-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A743DC23-6E43-430F-8602E2627BEABBDA_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 12" srcSet="https://static.scientificamerican.com/sciam/cache/file/A743DC23-6E43-430F-8602E2627BEABBDA_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A743DC23-6E43-430F-8602E2627BEABBDA_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-09-20">September 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/09-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BA50B824-C38E-4044-B5585BD5B6AE0805_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2280supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/BA50B824-C38E-4044-B5585BD5B6AE0805_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BA50B824-C38E-4044-B5585BD5B6AE0805_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-09-13">September 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/09-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BBA96C97-23E4-4FDC-AA1A8F42E5D850CF_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 11" srcSet="https://static.scientificamerican.com/sciam/cache/file/BBA96C97-23E4-4FDC-AA1A8F42E5D850CF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BBA96C97-23E4-4FDC-AA1A8F42E5D850CF_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-09-13">September 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/09-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/AF19EF8E-F1F4-40E7-AE1704F1D1229841_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2279supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/AF19EF8E-F1F4-40E7-AE1704F1D1229841_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/AF19EF8E-F1F4-40E7-AE1704F1D1229841_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-09-06">September 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/09-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D397BE4C-7FC1-42CD-AA1ED1A4D58995E5_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 10" srcSet="https://static.scientificamerican.com/sciam/cache/file/D397BE4C-7FC1-42CD-AA1ED1A4D58995E5_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D397BE4C-7FC1-42CD-AA1ED1A4D58995E5_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-09-06">September 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/08-30/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/757E1632-4A31-447B-B1772DA0642BB352_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2278supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/757E1632-4A31-447B-B1772DA0642BB352_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/757E1632-4A31-447B-B1772DA0642BB352_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-08-30">August 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/08-30/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B3322414-A12F-4F01-973723ADADA5C8C7_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 9" srcSet="https://static.scientificamerican.com/sciam/cache/file/B3322414-A12F-4F01-973723ADADA5C8C7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B3322414-A12F-4F01-973723ADADA5C8C7_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-08-30">August 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/08-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3310B97E-0489-4A75-AE2E27501B70E207_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2277supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/3310B97E-0489-4A75-AE2E27501B70E207_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3310B97E-0489-4A75-AE2E27501B70E207_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-08-23">August 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/08-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7A44BAAD-0B55-4854-93CB89354248E590_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 8" srcSet="https://static.scientificamerican.com/sciam/cache/file/7A44BAAD-0B55-4854-93CB89354248E590_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7A44BAAD-0B55-4854-93CB89354248E590_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-08-23">August 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/08-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D6FD7DAB-7B8B-4C7D-8C0E3818074A4B4F_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2276supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/D6FD7DAB-7B8B-4C7D-8C0E3818074A4B4F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D6FD7DAB-7B8B-4C7D-8C0E3818074A4B4F_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-08-16">August 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/08-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/AFF6FE4C-EE9C-434B-89AF32661E6ED536_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 7" srcSet="https://static.scientificamerican.com/sciam/cache/file/AFF6FE4C-EE9C-434B-89AF32661E6ED536_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/AFF6FE4C-EE9C-434B-89AF32661E6ED536_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-08-16">August 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/08-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C479FDEE-B9EC-496E-BF1D4E8D288EC50F_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2275supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/C479FDEE-B9EC-496E-BF1D4E8D288EC50F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C479FDEE-B9EC-496E-BF1D4E8D288EC50F_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-08-09">August 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/08-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CF77D86A-8689-4A3A-A4AD0F7728374FE3_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/CF77D86A-8689-4A3A-A4AD0F7728374FE3_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CF77D86A-8689-4A3A-A4AD0F7728374FE3_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-08-09">August 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/08-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F4DDF09F-1FA1-4A04-8D2306D8A27C418E_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2274supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/F4DDF09F-1FA1-4A04-8D2306D8A27C418E_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F4DDF09F-1FA1-4A04-8D2306D8A27C418E_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-08-02">August 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/08-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/797D308A-8B7C-4923-BDBCB0E28C8C03F5_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/797D308A-8B7C-4923-BDBCB0E28C8C03F5_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/797D308A-8B7C-4923-BDBCB0E28C8C03F5_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-08-02">August 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/07-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/584F3BB6-9171-4277-AC02240FA650C7E0_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2273supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/584F3BB6-9171-4277-AC02240FA650C7E0_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/584F3BB6-9171-4277-AC02240FA650C7E0_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-07-26">July 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/07-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7B5D612E-4071-4E6F-95561EC7066C3596_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/7B5D612E-4071-4E6F-95561EC7066C3596_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7B5D612E-4071-4E6F-95561EC7066C3596_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-07-26">July 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/07-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6440BB09-EBFD-42DB-8D9AB562AC95CBCC_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2272supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/6440BB09-EBFD-42DB-8D9AB562AC95CBCC_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6440BB09-EBFD-42DB-8D9AB562AC95CBCC_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-07-19">July 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/07-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1DE4ADEA-E19E-44CB-8BAB06E1BE6350E4_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/1DE4ADEA-E19E-44CB-8BAB06E1BE6350E4_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1DE4ADEA-E19E-44CB-8BAB06E1BE6350E4_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-07-19">July 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/07-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FE1F562A-D35C-467F-A12E8191B9EE9511_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2271supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/FE1F562A-D35C-467F-A12E8191B9EE9511_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FE1F562A-D35C-467F-A12E8191B9EE9511_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-07-12">July 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/07-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FF7E1CF6-6C4B-48DE-B72A1A468DBCFCB2_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/FF7E1CF6-6C4B-48DE-B72A1A468DBCFCB2_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FF7E1CF6-6C4B-48DE-B72A1A468DBCFCB2_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-07-12">July 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/07-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/391D6E49-64A5-4942-9454751F0F17ED49_source.gif?w=600" alt="SA Supplements Vol 88 Issue 2270supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/391D6E49-64A5-4942-9454751F0F17ED49_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/391D6E49-64A5-4942-9454751F0F17ED49_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-07-05">July 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/07-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D912473E-AF91-48D3-9BB44FB069E5CC4D_source.jpg?w=600" alt="Scientific American Magazine Vol 121 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/D912473E-AF91-48D3-9BB44FB069E5CC4D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D912473E-AF91-48D3-9BB44FB069E5CC4D_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-07-05">July 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/06-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A42C459E-854B-45CC-B4E1EBEB8B22649B_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2269supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A42C459E-854B-45CC-B4E1EBEB8B22649B_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A42C459E-854B-45CC-B4E1EBEB8B22649B_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-06-28">June 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/06-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BBAF9E9E-D016-4811-92C1854C7AB33066_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 26" srcSet="https://static.scientificamerican.com/sciam/cache/file/BBAF9E9E-D016-4811-92C1854C7AB33066_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BBAF9E9E-D016-4811-92C1854C7AB33066_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-06-28">June 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/06-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5054D0FA-3BAC-4598-A5D68503CF80CBCE_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2268supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/5054D0FA-3BAC-4598-A5D68503CF80CBCE_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/5054D0FA-3BAC-4598-A5D68503CF80CBCE_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-06-21">June 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/06-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/214A4A61-461F-4592-B3D903E6282D130A_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 25" srcSet="https://static.scientificamerican.com/sciam/cache/file/214A4A61-461F-4592-B3D903E6282D130A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/214A4A61-461F-4592-B3D903E6282D130A_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-06-21">June 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/06-14/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/007A28D5-6FDC-421C-9D910FE0CA67A9D0_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2267supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/007A28D5-6FDC-421C-9D910FE0CA67A9D0_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/007A28D5-6FDC-421C-9D910FE0CA67A9D0_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-06-14">June 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/06-14/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5FE7B3F5-8E1F-4AE6-B968376CADB2E607_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 24" srcSet="https://static.scientificamerican.com/sciam/cache/file/5FE7B3F5-8E1F-4AE6-B968376CADB2E607_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/5FE7B3F5-8E1F-4AE6-B968376CADB2E607_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-06-14">June 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/06-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B72E1F9D-8EB0-4114-9FE6D87A68D506BE_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2266supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/B72E1F9D-8EB0-4114-9FE6D87A68D506BE_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B72E1F9D-8EB0-4114-9FE6D87A68D506BE_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-06-07">June 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/06-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C8365673-32F9-474F-8E6B668496B638DA_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 23" srcSet="https://static.scientificamerican.com/sciam/cache/file/C8365673-32F9-474F-8E6B668496B638DA_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C8365673-32F9-474F-8E6B668496B638DA_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-06-07">June 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/05-31/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6DDD96BB-0276-4870-A07B66DEE4B68C19_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 22" srcSet="https://static.scientificamerican.com/sciam/cache/file/6DDD96BB-0276-4870-A07B66DEE4B68C19_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6DDD96BB-0276-4870-A07B66DEE4B68C19_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-05-31">May 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/05-31/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F1FADD86-990A-4F1D-8489E03BEE57D3F6_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2265supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/F1FADD86-990A-4F1D-8489E03BEE57D3F6_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F1FADD86-990A-4F1D-8489E03BEE57D3F6_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-05-31">May 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/05-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7EC68BDE-C591-4813-97573FCBDECFFED2_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2264supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/7EC68BDE-C591-4813-97573FCBDECFFED2_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7EC68BDE-C591-4813-97573FCBDECFFED2_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-05-24">May 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/05-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0969A820-40E2-4A84-BB1AA7AB77803EDF_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 21" srcSet="https://static.scientificamerican.com/sciam/cache/file/0969A820-40E2-4A84-BB1AA7AB77803EDF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0969A820-40E2-4A84-BB1AA7AB77803EDF_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-05-24">May 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/05-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3F2CAC66-AD47-4592-B51BB5DA66CA37E0_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2263supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/3F2CAC66-AD47-4592-B51BB5DA66CA37E0_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3F2CAC66-AD47-4592-B51BB5DA66CA37E0_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-05-17">May 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/05-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/83C29DAF-51BE-43FE-94A01706618ED9CD_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 20" srcSet="https://static.scientificamerican.com/sciam/cache/file/83C29DAF-51BE-43FE-94A01706618ED9CD_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/83C29DAF-51BE-43FE-94A01706618ED9CD_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-05-17">May 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/05-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/08127A76-E0BA-401D-915D7861EB665DEC_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2262supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/08127A76-E0BA-401D-915D7861EB665DEC_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/08127A76-E0BA-401D-915D7861EB665DEC_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-05-10">May 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/05-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0E78C9C2-B32C-4D28-AFA41C63F10B2781_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 19" srcSet="https://static.scientificamerican.com/sciam/cache/file/0E78C9C2-B32C-4D28-AFA41C63F10B2781_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0E78C9C2-B32C-4D28-AFA41C63F10B2781_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-05-10">May 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/05-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F9900772-A9F3-4E8D-BE87E17664643C29_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2261supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/F9900772-A9F3-4E8D-BE87E17664643C29_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F9900772-A9F3-4E8D-BE87E17664643C29_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-05-03">May 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/05-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4957AF73-FD26-4704-AB8473619AD3C6F0_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 18" srcSet="https://static.scientificamerican.com/sciam/cache/file/4957AF73-FD26-4704-AB8473619AD3C6F0_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4957AF73-FD26-4704-AB8473619AD3C6F0_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-05-03">May 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/04-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D9E45E6A-C03B-4B06-856D5FDAFDB341A9_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2260supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/D9E45E6A-C03B-4B06-856D5FDAFDB341A9_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D9E45E6A-C03B-4B06-856D5FDAFDB341A9_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-04-26">April 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/04-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/63D4A00D-E60F-4D70-978E4A4CB06F8B98_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 17" srcSet="https://static.scientificamerican.com/sciam/cache/file/63D4A00D-E60F-4D70-978E4A4CB06F8B98_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/63D4A00D-E60F-4D70-978E4A4CB06F8B98_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-04-26">April 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/04-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EC04F8CC-DC61-458F-8241A96B5068FE70_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2259supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/EC04F8CC-DC61-458F-8241A96B5068FE70_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EC04F8CC-DC61-458F-8241A96B5068FE70_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-04-19">April 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/04-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C8E7B1C5-7842-4FBE-AE6AEDF3DFD00371_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 16" srcSet="https://static.scientificamerican.com/sciam/cache/file/C8E7B1C5-7842-4FBE-AE6AEDF3DFD00371_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C8E7B1C5-7842-4FBE-AE6AEDF3DFD00371_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-04-19">April 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/04-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/06D3531B-DDB0-4F38-8EAB8DD1B1813813_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2258supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/06D3531B-DDB0-4F38-8EAB8DD1B1813813_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/06D3531B-DDB0-4F38-8EAB8DD1B1813813_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-04-12">April 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/04-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/33357B61-3F5A-479A-A5C93BA91E2526D1_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 15" srcSet="https://static.scientificamerican.com/sciam/cache/file/33357B61-3F5A-479A-A5C93BA91E2526D1_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/33357B61-3F5A-479A-A5C93BA91E2526D1_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-04-12">April 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/04-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E8883656-3D84-4B81-8FDB78EBADE09EC1_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2257supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/E8883656-3D84-4B81-8FDB78EBADE09EC1_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E8883656-3D84-4B81-8FDB78EBADE09EC1_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-04-05">April 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/04-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/845C6E35-8EA5-462F-BCF01E6AAEDDF617_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 14" srcSet="https://static.scientificamerican.com/sciam/cache/file/845C6E35-8EA5-462F-BCF01E6AAEDDF617_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/845C6E35-8EA5-462F-BCF01E6AAEDDF617_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-04-05">April 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/03-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8B6F480B-1156-47F9-9BD57D3EE2D198E9_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2256supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/8B6F480B-1156-47F9-9BD57D3EE2D198E9_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8B6F480B-1156-47F9-9BD57D3EE2D198E9_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-03-29">March 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/03-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FEEB84A0-8394-4100-B6BC7BA6F798E635_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 13" srcSet="https://static.scientificamerican.com/sciam/cache/file/FEEB84A0-8394-4100-B6BC7BA6F798E635_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FEEB84A0-8394-4100-B6BC7BA6F798E635_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-03-29">March 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/03-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/17B02123-B978-4376-B1B2FDD14E46F7D4_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2255supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/17B02123-B978-4376-B1B2FDD14E46F7D4_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/17B02123-B978-4376-B1B2FDD14E46F7D4_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-03-22">March 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/03-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8F6B8C87-179C-45FB-9BAE8731954ACA4E_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 12" srcSet="https://static.scientificamerican.com/sciam/cache/file/8F6B8C87-179C-45FB-9BAE8731954ACA4E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8F6B8C87-179C-45FB-9BAE8731954ACA4E_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-03-22">March 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/03-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A01B0780-C74A-45CA-A6D451C3F669D93B_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2254supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A01B0780-C74A-45CA-A6D451C3F669D93B_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A01B0780-C74A-45CA-A6D451C3F669D93B_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-03-15">March 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/03-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1D9B258A-6858-480F-B4D9626EDB27E65C_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 11" srcSet="https://static.scientificamerican.com/sciam/cache/file/1D9B258A-6858-480F-B4D9626EDB27E65C_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1D9B258A-6858-480F-B4D9626EDB27E65C_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-03-15">March 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/03-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B579C90E-A812-4943-87AC9C238E3CDBA8_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2253supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/B579C90E-A812-4943-87AC9C238E3CDBA8_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B579C90E-A812-4943-87AC9C238E3CDBA8_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-03-08">March 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/03-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5B34A22F-3BD3-445E-840B2AD2E84A3ECE_source.jpg?w=600" alt="Scientific American Magazine Vol 120 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loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-03-01">March 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/02-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6EDAF652-9DFA-4FA4-8089E72F11AB5C9B_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2251supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/6EDAF652-9DFA-4FA4-8089E72F11AB5C9B_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6EDAF652-9DFA-4FA4-8089E72F11AB5C9B_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-02-22">February 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/02-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FBDC5A90-787D-4A6D-8D921D9227D3D815_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 8" srcSet="https://static.scientificamerican.com/sciam/cache/file/FBDC5A90-787D-4A6D-8D921D9227D3D815_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FBDC5A90-787D-4A6D-8D921D9227D3D815_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-02-22">February 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a 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loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-02-01">February 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/01-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/08476948-0B3E-4C8A-8468EAD8DA1245B6_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2247supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/08476948-0B3E-4C8A-8468EAD8DA1245B6_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/08476948-0B3E-4C8A-8468EAD8DA1245B6_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-01-25">January 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/01-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E64DE44F-9E64-4E2F-B7B632746530A987_source.jpg?w=600" alt="Scientific American Magazine Vol 120 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/E64DE44F-9E64-4E2F-B7B632746530A987_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E64DE44F-9E64-4E2F-B7B632746530A987_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-01-25">January 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1919/01-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EB220AC2-B88C-48CD-91FEBE52627F626B_source.gif?w=600" alt="SA Supplements Vol 87 Issue 2246supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/EB220AC2-B88C-48CD-91FEBE52627F626B_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EB220AC2-B88C-48CD-91FEBE52627F626B_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1919-01-18">January 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1919/01-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img 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loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1919-01-04">January 1919</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/12-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7EE8A80B-1ECA-44D6-95624D729F863DA2_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 26" srcSet="https://static.scientificamerican.com/sciam/cache/file/7EE8A80B-1ECA-44D6-95624D729F863DA2_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7EE8A80B-1ECA-44D6-95624D729F863DA2_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-12-28">December 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/12-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C130DC88-0B03-4B16-81A1AF49542E2E63_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2242supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/C130DC88-0B03-4B16-81A1AF49542E2E63_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C130DC88-0B03-4B16-81A1AF49542E2E63_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-12-21">December 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/12-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B185E794-FCC9-4BE3-95C671CB7227423F_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 25" srcSet="https://static.scientificamerican.com/sciam/cache/file/B185E794-FCC9-4BE3-95C671CB7227423F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B185E794-FCC9-4BE3-95C671CB7227423F_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-12-21">December 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/12-14/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/AC75C8E5-F40F-494A-A3F3043ACE75C40D_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2241supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/AC75C8E5-F40F-494A-A3F3043ACE75C40D_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/AC75C8E5-F40F-494A-A3F3043ACE75C40D_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-12-14">December 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/12-14/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B23FD486-BA49-4E68-91FCA9E8CF25FD8D_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 24" srcSet="https://static.scientificamerican.com/sciam/cache/file/B23FD486-BA49-4E68-91FCA9E8CF25FD8D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B23FD486-BA49-4E68-91FCA9E8CF25FD8D_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-12-14">December 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/12-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4870234F-D167-4DED-8B4FF7E7C254FBF4_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2240supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/4870234F-D167-4DED-8B4FF7E7C254FBF4_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4870234F-D167-4DED-8B4FF7E7C254FBF4_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-12-07">December 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/12-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4CE3E1C3-DF93-4F6A-81BB344E8AC7D7FB_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 23" srcSet="https://static.scientificamerican.com/sciam/cache/file/4CE3E1C3-DF93-4F6A-81BB344E8AC7D7FB_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4CE3E1C3-DF93-4F6A-81BB344E8AC7D7FB_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-12-07">December 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/11-30/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/88430263-AC77-4A14-85F3C8CC2EBC9336_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2239supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/88430263-AC77-4A14-85F3C8CC2EBC9336_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/88430263-AC77-4A14-85F3C8CC2EBC9336_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-11-30">November 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/11-30/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/418422AA-2935-4428-A372E99EA1A156B3_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 22" srcSet="https://static.scientificamerican.com/sciam/cache/file/418422AA-2935-4428-A372E99EA1A156B3_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/418422AA-2935-4428-A372E99EA1A156B3_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-11-30">November 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/11-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4386529B-00FA-4491-9D9427C17CF4177C_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2238supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/4386529B-00FA-4491-9D9427C17CF4177C_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4386529B-00FA-4491-9D9427C17CF4177C_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-11-23">November 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/11-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3F841D85-FDDB-4A09-979C0ADA2E84AF1A_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 21" srcSet="https://static.scientificamerican.com/sciam/cache/file/3F841D85-FDDB-4A09-979C0ADA2E84AF1A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3F841D85-FDDB-4A09-979C0ADA2E84AF1A_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-11-23">November 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/11-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4E0DA8FC-E530-490F-A06EE234BCAA9748_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2237supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/4E0DA8FC-E530-490F-A06EE234BCAA9748_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4E0DA8FC-E530-490F-A06EE234BCAA9748_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-11-16">November 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/11-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/67F43193-2CB3-4590-8B8861CA8B201CBE_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 20" srcSet="https://static.scientificamerican.com/sciam/cache/file/67F43193-2CB3-4590-8B8861CA8B201CBE_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/67F43193-2CB3-4590-8B8861CA8B201CBE_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-11-16">November 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/11-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/06DE224E-6C1F-4C5B-9587AA8CA37AF70B_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2236supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/06DE224E-6C1F-4C5B-9587AA8CA37AF70B_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/06DE224E-6C1F-4C5B-9587AA8CA37AF70B_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-11-09">November 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/11-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A2EA16C3-9247-4646-AC43DD57E167FC49_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 19" srcSet="https://static.scientificamerican.com/sciam/cache/file/A2EA16C3-9247-4646-AC43DD57E167FC49_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A2EA16C3-9247-4646-AC43DD57E167FC49_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-11-09">November 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/11-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/14BFC92D-40BB-490D-86D8D07981F188C9_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2235supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/14BFC92D-40BB-490D-86D8D07981F188C9_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/14BFC92D-40BB-490D-86D8D07981F188C9_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-11-02">November 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/11-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EF0FF1C7-1FE5-4DEE-BEA5C25254FD2D0F_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 18" srcSet="https://static.scientificamerican.com/sciam/cache/file/EF0FF1C7-1FE5-4DEE-BEA5C25254FD2D0F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EF0FF1C7-1FE5-4DEE-BEA5C25254FD2D0F_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-11-02">November 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/10-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A9C2264D-1F6E-4DC4-998F2137AF60FF4D_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2234supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A9C2264D-1F6E-4DC4-998F2137AF60FF4D_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A9C2264D-1F6E-4DC4-998F2137AF60FF4D_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-10-26">October 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/10-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4FC3D01A-4E29-49DA-A379868EB396DC3D_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 17" srcSet="https://static.scientificamerican.com/sciam/cache/file/4FC3D01A-4E29-49DA-A379868EB396DC3D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4FC3D01A-4E29-49DA-A379868EB396DC3D_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-10-26">October 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/10-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4F6EEE27-01C7-4471-92E3E75E6E9DB730_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2233supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/4F6EEE27-01C7-4471-92E3E75E6E9DB730_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4F6EEE27-01C7-4471-92E3E75E6E9DB730_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-10-19">October 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/10-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CD761875-456A-45FE-BC86B37F141E8A47_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 16" srcSet="https://static.scientificamerican.com/sciam/cache/file/CD761875-456A-45FE-BC86B37F141E8A47_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CD761875-456A-45FE-BC86B37F141E8A47_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-10-19">October 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/10-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/80F4D56A-1CBE-46C4-BE49D3C010302024_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2232supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/80F4D56A-1CBE-46C4-BE49D3C010302024_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/80F4D56A-1CBE-46C4-BE49D3C010302024_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-10-12">October 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/10-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/42ED972D-3E96-407A-A68EF3D5111DAC6E_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 15" srcSet="https://static.scientificamerican.com/sciam/cache/file/42ED972D-3E96-407A-A68EF3D5111DAC6E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/42ED972D-3E96-407A-A68EF3D5111DAC6E_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-10-12">October 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/10-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D38362A3-E0EF-4AAB-B26BA322FC658B9F_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2231supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/D38362A3-E0EF-4AAB-B26BA322FC658B9F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D38362A3-E0EF-4AAB-B26BA322FC658B9F_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-10-05">October 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/10-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/39F62FE6-2528-47F6-8C6AA239B1234BA4_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 14" srcSet="https://static.scientificamerican.com/sciam/cache/file/39F62FE6-2528-47F6-8C6AA239B1234BA4_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/39F62FE6-2528-47F6-8C6AA239B1234BA4_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-10-05">October 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/09-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E6A79B10-9686-489F-98A1B323CD8256AB_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2230supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/E6A79B10-9686-489F-98A1B323CD8256AB_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E6A79B10-9686-489F-98A1B323CD8256AB_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-09-28">September 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/09-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1D6B193E-7A64-4D2A-A0329094A818F491_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 13" srcSet="https://static.scientificamerican.com/sciam/cache/file/1D6B193E-7A64-4D2A-A0329094A818F491_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1D6B193E-7A64-4D2A-A0329094A818F491_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-09-28">September 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/09-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9A13BA42-833A-4F90-858D5799596C97B5_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2229supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/9A13BA42-833A-4F90-858D5799596C97B5_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9A13BA42-833A-4F90-858D5799596C97B5_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-09-21">September 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/09-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BD591622-8973-454A-A5A498886DF7FBFD_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 12" srcSet="https://static.scientificamerican.com/sciam/cache/file/BD591622-8973-454A-A5A498886DF7FBFD_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BD591622-8973-454A-A5A498886DF7FBFD_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-09-21">September 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/09-14/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C9343CD1-DCB6-4894-94E74C820C7E0C85_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2228supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/C9343CD1-DCB6-4894-94E74C820C7E0C85_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C9343CD1-DCB6-4894-94E74C820C7E0C85_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-09-14">September 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/09-18-1918/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B2FAEBE1-817F-450A-AF8A0B4E5E12605A_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 11" srcSet="https://static.scientificamerican.com/sciam/cache/file/B2FAEBE1-817F-450A-AF8A0B4E5E12605A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B2FAEBE1-817F-450A-AF8A0B4E5E12605A_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-09-14">September 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/09-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/71DC6C0B-56A7-423F-B89CB62C69C7BCB3_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2227supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/71DC6C0B-56A7-423F-B89CB62C69C7BCB3_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/71DC6C0B-56A7-423F-B89CB62C69C7BCB3_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-09-07">September 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/09-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4164010A-311E-4FE2-A03B91B9EAD6529D_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 10" srcSet="https://static.scientificamerican.com/sciam/cache/file/4164010A-311E-4FE2-A03B91B9EAD6529D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4164010A-311E-4FE2-A03B91B9EAD6529D_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-09-07">September 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/08-31/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FE42A364-1B92-4875-9C260A4E9E5A265C_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2226supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/FE42A364-1B92-4875-9C260A4E9E5A265C_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FE42A364-1B92-4875-9C260A4E9E5A265C_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-08-31">August 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/08-31/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5C8DCAC3-381F-4D4A-80B2DD4F240313BF_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 9" srcSet="https://static.scientificamerican.com/sciam/cache/file/5C8DCAC3-381F-4D4A-80B2DD4F240313BF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/5C8DCAC3-381F-4D4A-80B2DD4F240313BF_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-08-31">August 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/08-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FDDD7054-443E-416F-938454F90B2F2EE9_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2225supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/FDDD7054-443E-416F-938454F90B2F2EE9_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FDDD7054-443E-416F-938454F90B2F2EE9_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-08-24">August 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/08-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C18E8739-00FF-4B0E-8352A7C1208A8128_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 8" srcSet="https://static.scientificamerican.com/sciam/cache/file/C18E8739-00FF-4B0E-8352A7C1208A8128_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C18E8739-00FF-4B0E-8352A7C1208A8128_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-08-24">August 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/08-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A8E98441-D7A1-4AD1-AFC637F561AF044C_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2224supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A8E98441-D7A1-4AD1-AFC637F561AF044C_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A8E98441-D7A1-4AD1-AFC637F561AF044C_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-08-17">August 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/08-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/878D2FEE-36F9-4C04-AA8F43F349A36F75_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 7" srcSet="https://static.scientificamerican.com/sciam/cache/file/878D2FEE-36F9-4C04-AA8F43F349A36F75_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/878D2FEE-36F9-4C04-AA8F43F349A36F75_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-08-17">August 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/08-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C874FB5E-BCCC-439B-80FA3CDD48561785_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2223supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/C874FB5E-BCCC-439B-80FA3CDD48561785_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C874FB5E-BCCC-439B-80FA3CDD48561785_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-08-10">August 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/08-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6B4E5D04-28CD-4BFD-922BF9167DFD2F9A_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/6B4E5D04-28CD-4BFD-922BF9167DFD2F9A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6B4E5D04-28CD-4BFD-922BF9167DFD2F9A_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-08-10">August 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/08-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6ABC3353-0A92-4134-8E68D92A2B035701_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2222supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/6ABC3353-0A92-4134-8E68D92A2B035701_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6ABC3353-0A92-4134-8E68D92A2B035701_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-08-03">August 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/08-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/65C5CF59-FCAC-4B16-B75A728CB7E82164_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/65C5CF59-FCAC-4B16-B75A728CB7E82164_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/65C5CF59-FCAC-4B16-B75A728CB7E82164_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-08-03">August 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/07-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E81A1FAE-4D35-4C0E-90EC6B50A7E86D44_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2221supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/E81A1FAE-4D35-4C0E-90EC6B50A7E86D44_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E81A1FAE-4D35-4C0E-90EC6B50A7E86D44_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-07-27">July 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/07-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/304A9311-7572-41E2-B7AE32C7415EC664_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/304A9311-7572-41E2-B7AE32C7415EC664_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/304A9311-7572-41E2-B7AE32C7415EC664_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-07-27">July 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/07-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EC37225F-D9C7-45D7-9872E8D1370863E9_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2220supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/EC37225F-D9C7-45D7-9872E8D1370863E9_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EC37225F-D9C7-45D7-9872E8D1370863E9_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-07-20">July 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/07-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7489F1B6-DA64-4C65-A79F4D6E1FD967DA_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/7489F1B6-DA64-4C65-A79F4D6E1FD967DA_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7489F1B6-DA64-4C65-A79F4D6E1FD967DA_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-07-20">July 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/07-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9131B7BB-E526-4522-BD4CD20D3B9FE45C_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2219supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/9131B7BB-E526-4522-BD4CD20D3B9FE45C_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9131B7BB-E526-4522-BD4CD20D3B9FE45C_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-07-13">July 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/07-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/323563E6-65E6-49DE-998677D1903F1517_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/323563E6-65E6-49DE-998677D1903F1517_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/323563E6-65E6-49DE-998677D1903F1517_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-07-13">July 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/07-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/163C1F3F-CA5A-4AAB-877F82FFBE0C4C81_source.gif?w=600" alt="SA Supplements Vol 86 Issue 2218supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/163C1F3F-CA5A-4AAB-877F82FFBE0C4C81_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/163C1F3F-CA5A-4AAB-877F82FFBE0C4C81_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-07-06">July 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/07-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D8EDCCD5-BC58-46D7-BA33524787E5E11F_source.jpg?w=600" alt="Scientific American Magazine Vol 119 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/D8EDCCD5-BC58-46D7-BA33524787E5E11F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D8EDCCD5-BC58-46D7-BA33524787E5E11F_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-07-06">July 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/06-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BEEE25B9-BD93-4E5B-8E199B8D3D4A296E_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2217supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/BEEE25B9-BD93-4E5B-8E199B8D3D4A296E_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BEEE25B9-BD93-4E5B-8E199B8D3D4A296E_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-06-29">June 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/06-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/DE372706-0458-4CCB-BC764CC49B3EF971_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 26" srcSet="https://static.scientificamerican.com/sciam/cache/file/DE372706-0458-4CCB-BC764CC49B3EF971_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/DE372706-0458-4CCB-BC764CC49B3EF971_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-06-29">June 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/06-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/33DFAB80-5896-4E89-93F823E213D5DFB0_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2216supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/33DFAB80-5896-4E89-93F823E213D5DFB0_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/33DFAB80-5896-4E89-93F823E213D5DFB0_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-06-22">June 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/06-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EC276F43-BEAC-47BF-8DB320CFD998877D_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 25" srcSet="https://static.scientificamerican.com/sciam/cache/file/EC276F43-BEAC-47BF-8DB320CFD998877D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EC276F43-BEAC-47BF-8DB320CFD998877D_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-06-22">June 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/06-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D115F7E3-CB9C-4350-BD3B75B17C93DE9D_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 24" srcSet="https://static.scientificamerican.com/sciam/cache/file/D115F7E3-CB9C-4350-BD3B75B17C93DE9D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D115F7E3-CB9C-4350-BD3B75B17C93DE9D_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-06-15">June 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/06-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CF3A003E-20D3-4122-8049CDD93982492C_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2215supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/CF3A003E-20D3-4122-8049CDD93982492C_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CF3A003E-20D3-4122-8049CDD93982492C_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-06-15">June 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/06-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/976D63C9-AD8C-4E7E-904818EBFF5519F8_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2214supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/976D63C9-AD8C-4E7E-904818EBFF5519F8_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/976D63C9-AD8C-4E7E-904818EBFF5519F8_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-06-08">June 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/06-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/00E6A88D-E4A7-4758-84FB8E47447D22E2_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 23" srcSet="https://static.scientificamerican.com/sciam/cache/file/00E6A88D-E4A7-4758-84FB8E47447D22E2_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/00E6A88D-E4A7-4758-84FB8E47447D22E2_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-06-08">June 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/274CE9EB-0FCF-4B16-838EBC54CC0A5FC3_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2213supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/274CE9EB-0FCF-4B16-838EBC54CC0A5FC3_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/274CE9EB-0FCF-4B16-838EBC54CC0A5FC3_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-06-01">June 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D4CD62AA-A453-402E-84E241BE7399F954_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 22" srcSet="https://static.scientificamerican.com/sciam/cache/file/D4CD62AA-A453-402E-84E241BE7399F954_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D4CD62AA-A453-402E-84E241BE7399F954_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-06-01">June 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/05-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E223C523-92B1-43BC-8A2ACCCA45512788_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2212supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/E223C523-92B1-43BC-8A2ACCCA45512788_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E223C523-92B1-43BC-8A2ACCCA45512788_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-05-25">May 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/05-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BAFB4BF0-042A-4FCB-A8E440C3046F81A4_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 21" srcSet="https://static.scientificamerican.com/sciam/cache/file/BAFB4BF0-042A-4FCB-A8E440C3046F81A4_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BAFB4BF0-042A-4FCB-A8E440C3046F81A4_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-05-25">May 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/05-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1E158AA9-00D5-4BDF-94ADA2CBE13B1DAF_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2211supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/1E158AA9-00D5-4BDF-94ADA2CBE13B1DAF_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1E158AA9-00D5-4BDF-94ADA2CBE13B1DAF_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-05-18">May 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/05-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EF7F5BE6-1A3D-451B-93779FE9D37AD966_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 20" srcSet="https://static.scientificamerican.com/sciam/cache/file/EF7F5BE6-1A3D-451B-93779FE9D37AD966_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EF7F5BE6-1A3D-451B-93779FE9D37AD966_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-05-18">May 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/05-11/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C7B991E6-BDD7-4172-B3D6631EF6891DAB_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2210supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/C7B991E6-BDD7-4172-B3D6631EF6891DAB_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C7B991E6-BDD7-4172-B3D6631EF6891DAB_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-05-11">May 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/05-11/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6AD35E23-9A3C-4939-9865A7A832A3ABCE_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 19" srcSet="https://static.scientificamerican.com/sciam/cache/file/6AD35E23-9A3C-4939-9865A7A832A3ABCE_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6AD35E23-9A3C-4939-9865A7A832A3ABCE_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-05-11">May 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/05-04/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/DC0DAADE-51AB-4F58-8A775976926E0ADD_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2209supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/DC0DAADE-51AB-4F58-8A775976926E0ADD_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/DC0DAADE-51AB-4F58-8A775976926E0ADD_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-05-04">May 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/05-04/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1E8DE02B-8DD5-428C-BE55E95A71B784AE_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 18" srcSet="https://static.scientificamerican.com/sciam/cache/file/1E8DE02B-8DD5-428C-BE55E95A71B784AE_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1E8DE02B-8DD5-428C-BE55E95A71B784AE_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-05-04">May 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/04-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/10EF2506-4839-4699-88740C04286B959F_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2208supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/10EF2506-4839-4699-88740C04286B959F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/10EF2506-4839-4699-88740C04286B959F_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-04-27">April 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/04-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6E7BE79E-D489-498B-98F978FAAF795A8C_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 17" srcSet="https://static.scientificamerican.com/sciam/cache/file/6E7BE79E-D489-498B-98F978FAAF795A8C_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6E7BE79E-D489-498B-98F978FAAF795A8C_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-04-27">April 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/04-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0777C9F7-B4F0-44AA-98C8F9FF383B1F4F_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2207supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/0777C9F7-B4F0-44AA-98C8F9FF383B1F4F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0777C9F7-B4F0-44AA-98C8F9FF383B1F4F_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-04-20">April 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/04-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F74E78B7-A1F6-4381-B1038B3B66329570_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 16" srcSet="https://static.scientificamerican.com/sciam/cache/file/F74E78B7-A1F6-4381-B1038B3B66329570_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F74E78B7-A1F6-4381-B1038B3B66329570_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-04-20">April 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/04-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0072CFCF-97CF-4D60-AD97E26263F50441_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 15" srcSet="https://static.scientificamerican.com/sciam/cache/file/0072CFCF-97CF-4D60-AD97E26263F50441_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0072CFCF-97CF-4D60-AD97E26263F50441_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-04-13">April 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/04-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CF56E76F-CA61-4B84-9485D81064C7962A_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2206supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/CF56E76F-CA61-4B84-9485D81064C7962A_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CF56E76F-CA61-4B84-9485D81064C7962A_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-04-13">April 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/04-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8E6B9446-5E60-49D0-9A43628D7A941A86_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2205supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/8E6B9446-5E60-49D0-9A43628D7A941A86_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8E6B9446-5E60-49D0-9A43628D7A941A86_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-04-06">April 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/04-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E9CB470A-76FB-4C58-98E31B9120F7C6DD_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 14" srcSet="https://static.scientificamerican.com/sciam/cache/file/E9CB470A-76FB-4C58-98E31B9120F7C6DD_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E9CB470A-76FB-4C58-98E31B9120F7C6DD_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-04-06">April 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/03-30/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6233D049-8A40-40EF-9935AC9AAEDC98E7_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 13" srcSet="https://static.scientificamerican.com/sciam/cache/file/6233D049-8A40-40EF-9935AC9AAEDC98E7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6233D049-8A40-40EF-9935AC9AAEDC98E7_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-03-30">March 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/03-30/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/636E1058-0EAD-4AB1-921D7E4A31142108_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2204supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/636E1058-0EAD-4AB1-921D7E4A31142108_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/636E1058-0EAD-4AB1-921D7E4A31142108_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-03-30">March 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/03-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F2CB2967-9A44-4B28-B0A0F091791C38B6_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 12" srcSet="https://static.scientificamerican.com/sciam/cache/file/F2CB2967-9A44-4B28-B0A0F091791C38B6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F2CB2967-9A44-4B28-B0A0F091791C38B6_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-03-23">March 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/03-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/202F16A3-722D-486F-AFB2AD6AD45179CC_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2203supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/202F16A3-722D-486F-AFB2AD6AD45179CC_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/202F16A3-722D-486F-AFB2AD6AD45179CC_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-03-23">March 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/03-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/03819512-0B72-4FD5-A6B4797A002BED13_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2202supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/03819512-0B72-4FD5-A6B4797A002BED13_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/03819512-0B72-4FD5-A6B4797A002BED13_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-03-16">March 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/03-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E28104A3-BBE5-49B5-AD76486166EA56B7_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 11" srcSet="https://static.scientificamerican.com/sciam/cache/file/E28104A3-BBE5-49B5-AD76486166EA56B7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E28104A3-BBE5-49B5-AD76486166EA56B7_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-03-16">March 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/03-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6766D377-AF48-4FCD-AAEA06720CB55DDA_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 10" srcSet="https://static.scientificamerican.com/sciam/cache/file/6766D377-AF48-4FCD-AAEA06720CB55DDA_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6766D377-AF48-4FCD-AAEA06720CB55DDA_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-03-09">March 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/03-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C8D6B2BE-14B1-42CA-A8FB643785FFD94F_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2201supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/C8D6B2BE-14B1-42CA-A8FB643785FFD94F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C8D6B2BE-14B1-42CA-A8FB643785FFD94F_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-03-09">March 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/03-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/204D5D4A-A90E-4441-8A44DE9027D29EC1_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 9" srcSet="https://static.scientificamerican.com/sciam/cache/file/204D5D4A-A90E-4441-8A44DE9027D29EC1_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/204D5D4A-A90E-4441-8A44DE9027D29EC1_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-03-02">March 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/03-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3957D1EA-2E33-4F9A-9C73C00348762770_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2200supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/3957D1EA-2E33-4F9A-9C73C00348762770_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3957D1EA-2E33-4F9A-9C73C00348762770_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-03-02">March 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/02-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/446C5549-AEB6-44E0-A2141A4E746771C7_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2199supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/446C5549-AEB6-44E0-A2141A4E746771C7_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/446C5549-AEB6-44E0-A2141A4E746771C7_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-02-23">February 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/02-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/23762F4D-4CC6-4490-BCFF9FAF66A8E73A_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 8" srcSet="https://static.scientificamerican.com/sciam/cache/file/23762F4D-4CC6-4490-BCFF9FAF66A8E73A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/23762F4D-4CC6-4490-BCFF9FAF66A8E73A_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-02-23">February 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/02-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C3C3A68B-38F7-45BC-AF7D06ADC56DA1C8_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 7" srcSet="https://static.scientificamerican.com/sciam/cache/file/C3C3A68B-38F7-45BC-AF7D06ADC56DA1C8_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C3C3A68B-38F7-45BC-AF7D06ADC56DA1C8_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-02-16">February 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/02-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2971AD32-C317-47B4-93F6D8538622AFC4_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2198supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/2971AD32-C317-47B4-93F6D8538622AFC4_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2971AD32-C317-47B4-93F6D8538622AFC4_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-02-16">February 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/02-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/94F5CBAE-E560-4A15-BC9CD5BB58D659E7_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/94F5CBAE-E560-4A15-BC9CD5BB58D659E7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/94F5CBAE-E560-4A15-BC9CD5BB58D659E7_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-02-09">February 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/02-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/DCF000F6-CF45-45F8-9C65741A4357509A_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2197supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/DCF000F6-CF45-45F8-9C65741A4357509A_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/DCF000F6-CF45-45F8-9C65741A4357509A_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-02-09">February 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/02-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E9F2B865-FAB3-4BFB-858C1091D77A45A7_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2196supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/E9F2B865-FAB3-4BFB-858C1091D77A45A7_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E9F2B865-FAB3-4BFB-858C1091D77A45A7_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-02-02">February 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/02-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/90395D01-FA6C-49C2-A638D93AA4F42CC1_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/90395D01-FA6C-49C2-A638D93AA4F42CC1_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/90395D01-FA6C-49C2-A638D93AA4F42CC1_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-02-02">February 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/01-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/803CD945-100B-47FD-AF6C5517A15FC05F_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/803CD945-100B-47FD-AF6C5517A15FC05F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/803CD945-100B-47FD-AF6C5517A15FC05F_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-01-26">January 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/01-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1A394766-456E-49C0-8AE7FDE5193BEE7C_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2195supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/1A394766-456E-49C0-8AE7FDE5193BEE7C_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1A394766-456E-49C0-8AE7FDE5193BEE7C_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-01-26">January 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/01-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/337CDD0F-1050-4F93-A3E849979C1B4555_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/337CDD0F-1050-4F93-A3E849979C1B4555_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/337CDD0F-1050-4F93-A3E849979C1B4555_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-01-19">January 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/01-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1DE8892A-C0B5-4DCA-9A4C9FD72DF342CC_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2194supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/1DE8892A-C0B5-4DCA-9A4C9FD72DF342CC_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1DE8892A-C0B5-4DCA-9A4C9FD72DF342CC_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-01-19">January 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/01-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9065524C-304F-4130-BC1E82B970B4B6E2_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2193supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/9065524C-304F-4130-BC1E82B970B4B6E2_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9065524C-304F-4130-BC1E82B970B4B6E2_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-01-12">January 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/01-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3AF5C884-82E1-4F40-A3089BF4EC4E9B2C_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/3AF5C884-82E1-4F40-A3089BF4EC4E9B2C_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3AF5C884-82E1-4F40-A3089BF4EC4E9B2C_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-01-12">January 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1918/01-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/AA69710C-5F92-47D2-965D63A1D743EE24_source.jpg?w=600" alt="Scientific American Magazine Vol 118 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/AA69710C-5F92-47D2-965D63A1D743EE24_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/AA69710C-5F92-47D2-965D63A1D743EE24_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1918-01-05">January 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1918/01-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/16D5BFB7-076E-4053-AE60B3A3806F1481_source.gif?w=600" alt="SA Supplements Vol 85 Issue 2192supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/16D5BFB7-076E-4053-AE60B3A3806F1481_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/16D5BFB7-076E-4053-AE60B3A3806F1481_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1918-01-05">January 1918</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/12-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C00C8E10-2CDC-41DB-8A298B51D00DE941_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 26" srcSet="https://static.scientificamerican.com/sciam/cache/file/C00C8E10-2CDC-41DB-8A298B51D00DE941_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C00C8E10-2CDC-41DB-8A298B51D00DE941_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-12-29">December 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/12-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/48B80B6C-22FB-4626-A1EE14FEBCCD94AD_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 25" srcSet="https://static.scientificamerican.com/sciam/cache/file/48B80B6C-22FB-4626-A1EE14FEBCCD94AD_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/48B80B6C-22FB-4626-A1EE14FEBCCD94AD_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-12-22">December 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/12-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9DFB1B6E-80C6-4A0A-B92630AC019684E7_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2190supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/9DFB1B6E-80C6-4A0A-B92630AC019684E7_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9DFB1B6E-80C6-4A0A-B92630AC019684E7_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1917-12-22">December 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/12-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/094761B6-C755-470E-BCEA54AC9904078B_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 24" srcSet="https://static.scientificamerican.com/sciam/cache/file/094761B6-C755-470E-BCEA54AC9904078B_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/094761B6-C755-470E-BCEA54AC9904078B_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-12-15">December 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/12-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/70F28E53-805D-4D91-92414B4709F53528_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2189supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/70F28E53-805D-4D91-92414B4709F53528_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/70F28E53-805D-4D91-92414B4709F53528_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1917-12-15">December 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/12-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F13DA144-C1A3-4218-93F61A2B77DD56BC_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2188supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/F13DA144-C1A3-4218-93F61A2B77DD56BC_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F13DA144-C1A3-4218-93F61A2B77DD56BC_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1917-12-08">December 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/12-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3D9208BB-5AE2-4317-A33358347B9EDDBD_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 23" srcSet="https://static.scientificamerican.com/sciam/cache/file/3D9208BB-5AE2-4317-A33358347B9EDDBD_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3D9208BB-5AE2-4317-A33358347B9EDDBD_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-12-08">December 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/76233E50-566E-42FD-B86A7A731FCB653E_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 22" srcSet="https://static.scientificamerican.com/sciam/cache/file/76233E50-566E-42FD-B86A7A731FCB653E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/76233E50-566E-42FD-B86A7A731FCB653E_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-12-01">December 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/31C3536B-EF2F-41CD-B66C73564D70EF5C_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2187supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/31C3536B-EF2F-41CD-B66C73564D70EF5C_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/31C3536B-EF2F-41CD-B66C73564D70EF5C_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1917-12-01">December 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/11-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B823DEC3-C8BA-4E38-BF9CC68CACE860A4_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 21" srcSet="https://static.scientificamerican.com/sciam/cache/file/B823DEC3-C8BA-4E38-BF9CC68CACE860A4_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B823DEC3-C8BA-4E38-BF9CC68CACE860A4_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-11-24">November 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/11-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7312FEE9-2911-4619-AB23F44B708A814C_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2186supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/7312FEE9-2911-4619-AB23F44B708A814C_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7312FEE9-2911-4619-AB23F44B708A814C_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1917-11-24">November 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/11-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/DDB0C000-D34C-423F-87E2284DE6599936_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2185supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/DDB0C000-D34C-423F-87E2284DE6599936_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/DDB0C000-D34C-423F-87E2284DE6599936_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1917-11-17">November 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/11-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B64ED6E8-1EDD-4A19-8CA3C644AB930E98_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 20" srcSet="https://static.scientificamerican.com/sciam/cache/file/B64ED6E8-1EDD-4A19-8CA3C644AB930E98_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B64ED6E8-1EDD-4A19-8CA3C644AB930E98_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-11-17">November 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/11-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2D80CEFA-92F2-4FFE-A27726E02BD39363_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 19" srcSet="https://static.scientificamerican.com/sciam/cache/file/2D80CEFA-92F2-4FFE-A27726E02BD39363_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2D80CEFA-92F2-4FFE-A27726E02BD39363_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-11-10">November 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/11-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7B69B517-7AC1-4C5D-87D1C57F15CF7489_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2184supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/7B69B517-7AC1-4C5D-87D1C57F15CF7489_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7B69B517-7AC1-4C5D-87D1C57F15CF7489_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1917-11-10">November 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/11-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/63DACF30-1308-4E66-BDADE6CE93B667D3_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 18" srcSet="https://static.scientificamerican.com/sciam/cache/file/63DACF30-1308-4E66-BDADE6CE93B667D3_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/63DACF30-1308-4E66-BDADE6CE93B667D3_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-11-03">November 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/11-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BA951C33-91E8-4411-BF0052B92B88A887_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2183supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/BA951C33-91E8-4411-BF0052B92B88A887_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BA951C33-91E8-4411-BF0052B92B88A887_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1917-11-03">November 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/10-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A49AC435-BB40-48B3-838075FA88508A0D_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2182supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A49AC435-BB40-48B3-838075FA88508A0D_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A49AC435-BB40-48B3-838075FA88508A0D_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1917-10-27">October 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/10-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4E7BA193-316D-49EB-AC430F544B8BF250_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 17" srcSet="https://static.scientificamerican.com/sciam/cache/file/4E7BA193-316D-49EB-AC430F544B8BF250_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4E7BA193-316D-49EB-AC430F544B8BF250_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-10-27">October 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/10-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/42B30B00-B92D-4C1D-9D7405618A54E5B3_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2181supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/42B30B00-B92D-4C1D-9D7405618A54E5B3_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/42B30B00-B92D-4C1D-9D7405618A54E5B3_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1917-10-20">October 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/10-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/35FA44C8-8415-4A8A-92F378438925D4D5_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 16" srcSet="https://static.scientificamerican.com/sciam/cache/file/35FA44C8-8415-4A8A-92F378438925D4D5_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/35FA44C8-8415-4A8A-92F378438925D4D5_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-10-20">October 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/10-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FA6F4A23-81D1-4B2A-99EBE6C07A67B2EC_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 15" srcSet="https://static.scientificamerican.com/sciam/cache/file/FA6F4A23-81D1-4B2A-99EBE6C07A67B2EC_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FA6F4A23-81D1-4B2A-99EBE6C07A67B2EC_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-10-13">October 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/10-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F3D6D4D7-BF80-42E4-89769588A7672006_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2180supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/F3D6D4D7-BF80-42E4-89769588A7672006_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F3D6D4D7-BF80-42E4-89769588A7672006_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1917-10-13">October 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/10-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3AEB9612-AE8A-43BC-8DB69CE97752E110_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 14" srcSet="https://static.scientificamerican.com/sciam/cache/file/3AEB9612-AE8A-43BC-8DB69CE97752E110_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3AEB9612-AE8A-43BC-8DB69CE97752E110_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-10-06">October 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/10-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8DC9AC86-FA0B-4F86-8F614A4BBDB0524E_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2179supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/8DC9AC86-FA0B-4F86-8F614A4BBDB0524E_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8DC9AC86-FA0B-4F86-8F614A4BBDB0524E_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1917-10-06">October 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1917/09-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CD4C5099-DBCE-418E-A385DACC43400EBC_source.jpg?w=600" alt="Scientific American Magazine Vol 117 Issue 13" srcSet="https://static.scientificamerican.com/sciam/cache/file/CD4C5099-DBCE-418E-A385DACC43400EBC_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CD4C5099-DBCE-418E-A385DACC43400EBC_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-09-29">September 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/09-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4D697CFC-6CE5-4B4A-9C1D0C8004076DB5_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2178supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/4D697CFC-6CE5-4B4A-9C1D0C8004076DB5_source.gif?w=300 300w, 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loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1917-09-22">September 1917</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1917/09-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/287BF540-DDBB-40AE-AA2CABE2B05A13F8_source.gif?w=600" alt="SA Supplements Vol 84 Issue 2177supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/287BF540-DDBB-40AE-AA2CABE2B05A13F8_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/287BF540-DDBB-40AE-AA2CABE2B05A13F8_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div 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