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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></div></div></div><div class="issue__list-8JHD2"><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/12-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4D918B93-804E-404B-89DBEA0F605A69A4_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 26" srcSet="https://static.scientificamerican.com/sciam/cache/file/4D918B93-804E-404B-89DBEA0F605A69A4_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4D918B93-804E-404B-89DBEA0F605A69A4_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="1915-12-25">December 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/12-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9506C4C4-A5E3-46A2-A068737DD913837E_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2085supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/9506C4C4-A5E3-46A2-A068737DD913837E_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9506C4C4-A5E3-46A2-A068737DD913837E_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="1915-12-18">December 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/12-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D70D5973-9647-4A1D-9E4130837968F4A8_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 25" srcSet="https://static.scientificamerican.com/sciam/cache/file/D70D5973-9647-4A1D-9E4130837968F4A8_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D70D5973-9647-4A1D-9E4130837968F4A8_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="1915-12-18">December 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/12-11/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/349ECBFC-EC16-495B-8ACC950CB1A1C329_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2084supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/349ECBFC-EC16-495B-8ACC950CB1A1C329_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/349ECBFC-EC16-495B-8ACC950CB1A1C329_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="1915-12-11">December 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/12-11/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A8A9F1E6-9DD3-46F6-AA6C4D8454584A4A_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 24" srcSet="https://static.scientificamerican.com/sciam/cache/file/A8A9F1E6-9DD3-46F6-AA6C4D8454584A4A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A8A9F1E6-9DD3-46F6-AA6C4D8454584A4A_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="1915-12-11">December 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/12-04/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F9CAF1B4-2DF3-470D-B67F079C97DF32BE_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2083supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/F9CAF1B4-2DF3-470D-B67F079C97DF32BE_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F9CAF1B4-2DF3-470D-B67F079C97DF32BE_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="1915-12-04">December 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/12-04/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/726F47C4-7D8D-447F-8B50C2AE7BF44378_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 23" srcSet="https://static.scientificamerican.com/sciam/cache/file/726F47C4-7D8D-447F-8B50C2AE7BF44378_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/726F47C4-7D8D-447F-8B50C2AE7BF44378_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="1915-12-04">December 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/11-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C205A658-D9AE-4F87-80D5825D6CD0202D_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2082supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/C205A658-D9AE-4F87-80D5825D6CD0202D_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C205A658-D9AE-4F87-80D5825D6CD0202D_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="1915-11-27">November 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/11-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A4CFF888-24F1-4976-B5F9E2D94CD0E11E_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 22" srcSet="https://static.scientificamerican.com/sciam/cache/file/A4CFF888-24F1-4976-B5F9E2D94CD0E11E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A4CFF888-24F1-4976-B5F9E2D94CD0E11E_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="1915-11-27">November 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/11-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/38C5FCEA-B17A-462D-BECFEF0B7A2FF844_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 21" srcSet="https://static.scientificamerican.com/sciam/cache/file/38C5FCEA-B17A-462D-BECFEF0B7A2FF844_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/38C5FCEA-B17A-462D-BECFEF0B7A2FF844_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="1915-11-20">November 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/11-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4D1464BA-45D7-4C9D-806400A6C35236BD_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2081supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/4D1464BA-45D7-4C9D-806400A6C35236BD_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4D1464BA-45D7-4C9D-806400A6C35236BD_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="1915-11-20">November 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/11-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/81A59FD2-5CD7-4C32-9B857957C8C85530_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2080supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/81A59FD2-5CD7-4C32-9B857957C8C85530_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/81A59FD2-5CD7-4C32-9B857957C8C85530_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="1915-11-13">November 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/11-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3AA22FB0-7B75-42AA-ABDD146FCA9D2A82_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 20" srcSet="https://static.scientificamerican.com/sciam/cache/file/3AA22FB0-7B75-42AA-ABDD146FCA9D2A82_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3AA22FB0-7B75-42AA-ABDD146FCA9D2A82_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="1915-11-13">November 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/11-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BB539CBC-EFFE-417C-B8A13A1EDADF2503_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2079supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/BB539CBC-EFFE-417C-B8A13A1EDADF2503_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BB539CBC-EFFE-417C-B8A13A1EDADF2503_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="1915-11-06">November 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/11-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/622E9C35-E960-488A-BC9A5939F3B7804F_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 19" srcSet="https://static.scientificamerican.com/sciam/cache/file/622E9C35-E960-488A-BC9A5939F3B7804F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/622E9C35-E960-488A-BC9A5939F3B7804F_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="1915-11-06">November 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/10-30/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E446A4E1-864B-460B-859EFCF963B8AAD7_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2078supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/E446A4E1-864B-460B-859EFCF963B8AAD7_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E446A4E1-864B-460B-859EFCF963B8AAD7_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="1915-10-30">October 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/10-30/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5F147F3C-3777-471B-AB893AA93F32BF94_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 18" srcSet="https://static.scientificamerican.com/sciam/cache/file/5F147F3C-3777-471B-AB893AA93F32BF94_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/5F147F3C-3777-471B-AB893AA93F32BF94_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="1915-10-30">October 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/10-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/118906EC-E93A-4A47-AB03FAF8407C8A5A_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2077supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/118906EC-E93A-4A47-AB03FAF8407C8A5A_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/118906EC-E93A-4A47-AB03FAF8407C8A5A_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="1915-10-23">October 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/10-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C513741C-13B7-49F2-98E7BB5743B6FD5D_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 17" srcSet="https://static.scientificamerican.com/sciam/cache/file/C513741C-13B7-49F2-98E7BB5743B6FD5D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C513741C-13B7-49F2-98E7BB5743B6FD5D_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="1915-10-23">October 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/10-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3066DF5D-97C5-4F0E-A33F612E2BD029C2_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2076supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/3066DF5D-97C5-4F0E-A33F612E2BD029C2_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3066DF5D-97C5-4F0E-A33F612E2BD029C2_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="1915-10-16">October 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/10-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D4C50B3A-1087-4668-BA6D46378454142F_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 16" srcSet="https://static.scientificamerican.com/sciam/cache/file/D4C50B3A-1087-4668-BA6D46378454142F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D4C50B3A-1087-4668-BA6D46378454142F_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="1915-10-16">October 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/10-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/11643819-6C5E-4BA1-B168408CD3644A06_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2075supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/11643819-6C5E-4BA1-B168408CD3644A06_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/11643819-6C5E-4BA1-B168408CD3644A06_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="1915-10-09">October 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/10-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CFA52433-D353-40A5-A964A85FF839C2C1_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 15" srcSet="https://static.scientificamerican.com/sciam/cache/file/CFA52433-D353-40A5-A964A85FF839C2C1_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CFA52433-D353-40A5-A964A85FF839C2C1_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="1915-10-09">October 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/10-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/71E352EC-6444-45A9-8214C749EEE6D1A1_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2074supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/71E352EC-6444-45A9-8214C749EEE6D1A1_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/71E352EC-6444-45A9-8214C749EEE6D1A1_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="1915-10-02">October 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/10-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EAEC0EE7-1966-408C-B8BD968029D26D6C_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 14" srcSet="https://static.scientificamerican.com/sciam/cache/file/EAEC0EE7-1966-408C-B8BD968029D26D6C_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EAEC0EE7-1966-408C-B8BD968029D26D6C_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="1915-10-02">October 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/09-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FD392F33-66EC-4896-93156BE1BCD8D12F_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2073supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/FD392F33-66EC-4896-93156BE1BCD8D12F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FD392F33-66EC-4896-93156BE1BCD8D12F_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="1915-09-25">September 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/09-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2201D579-34AB-4233-AF9E8FC396B768C9_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 13" srcSet="https://static.scientificamerican.com/sciam/cache/file/2201D579-34AB-4233-AF9E8FC396B768C9_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2201D579-34AB-4233-AF9E8FC396B768C9_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="1915-09-25">September 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/09-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EF124DCC-A804-4A6D-AAAEA81E400F3D1B_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2072supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/EF124DCC-A804-4A6D-AAAEA81E400F3D1B_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EF124DCC-A804-4A6D-AAAEA81E400F3D1B_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="1915-09-18">September 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/09-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2B087218-E365-4354-AFC8C9A41C327F19_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 12" srcSet="https://static.scientificamerican.com/sciam/cache/file/2B087218-E365-4354-AFC8C9A41C327F19_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2B087218-E365-4354-AFC8C9A41C327F19_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="1915-09-18">September 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/09-11/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A2E6C8A0-E636-4103-88565FA3BED97FF6_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2071supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A2E6C8A0-E636-4103-88565FA3BED97FF6_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A2E6C8A0-E636-4103-88565FA3BED97FF6_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="1915-09-11">September 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/09-11/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9D884564-E774-4753-8C6D40D3F078F236_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 11" srcSet="https://static.scientificamerican.com/sciam/cache/file/9D884564-E774-4753-8C6D40D3F078F236_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9D884564-E774-4753-8C6D40D3F078F236_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="1915-09-11">September 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/09-04/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/39F86271-0686-4C41-87F0F8513847DEC0_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2070supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/39F86271-0686-4C41-87F0F8513847DEC0_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/39F86271-0686-4C41-87F0F8513847DEC0_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="1915-09-04">September 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/09-04/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E4D35EEB-E7DB-45CA-9469D5C430E1EF45_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 10" srcSet="https://static.scientificamerican.com/sciam/cache/file/E4D35EEB-E7DB-45CA-9469D5C430E1EF45_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E4D35EEB-E7DB-45CA-9469D5C430E1EF45_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="1915-09-04">September 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/08-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0E9F83D7-6C91-4A84-A405904B95503745_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 9" srcSet="https://static.scientificamerican.com/sciam/cache/file/0E9F83D7-6C91-4A84-A405904B95503745_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0E9F83D7-6C91-4A84-A405904B95503745_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="1915-08-28">August 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/08-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5C5465B3-AA9D-4894-86746023D73CD93E_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2069supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/5C5465B3-AA9D-4894-86746023D73CD93E_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/5C5465B3-AA9D-4894-86746023D73CD93E_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="1915-08-28">August 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/08-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6D568617-0B8C-4885-9C5943406538CD94_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2068supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/6D568617-0B8C-4885-9C5943406538CD94_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6D568617-0B8C-4885-9C5943406538CD94_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="1915-08-21">August 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/08-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8C0152E5-10C6-4D9F-A9317D923BB9E746_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 8" srcSet="https://static.scientificamerican.com/sciam/cache/file/8C0152E5-10C6-4D9F-A9317D923BB9E746_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8C0152E5-10C6-4D9F-A9317D923BB9E746_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="1915-08-21">August 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/08-14/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6D53B260-83E9-44D9-867D6C9196215B3B_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2067supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/6D53B260-83E9-44D9-867D6C9196215B3B_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6D53B260-83E9-44D9-867D6C9196215B3B_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="1915-08-14">August 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/08-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BF1C50AE-A662-42DB-953EC6C4A55A39FE_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2066supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/BF1C50AE-A662-42DB-953EC6C4A55A39FE_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BF1C50AE-A662-42DB-953EC6C4A55A39FE_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="1915-08-07">August 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/08-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8E6EADCA-0608-4742-AA424A57C1681FEB_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/8E6EADCA-0608-4742-AA424A57C1681FEB_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8E6EADCA-0608-4742-AA424A57C1681FEB_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="1915-08-07">August 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/07-31/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B0650BCE-2642-423C-AECD1E25C171BD8B_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2065supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/B0650BCE-2642-423C-AECD1E25C171BD8B_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B0650BCE-2642-423C-AECD1E25C171BD8B_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="1915-07-31">July 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/07-31/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C02DD749-9034-4929-92637801D3782A28_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/C02DD749-9034-4929-92637801D3782A28_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C02DD749-9034-4929-92637801D3782A28_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="1915-07-31">July 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/07-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7C3E91D6-0E0B-48A9-824965EFFD6F95D8_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2064supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/7C3E91D6-0E0B-48A9-824965EFFD6F95D8_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7C3E91D6-0E0B-48A9-824965EFFD6F95D8_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="1915-07-24">July 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/07-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F3E81017-5DD3-414A-986347AB6E7C9242_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/F3E81017-5DD3-414A-986347AB6E7C9242_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F3E81017-5DD3-414A-986347AB6E7C9242_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="1915-07-24">July 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/07-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0B8E40A8-D656-4A84-9D7FD45A29B56A45_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2063supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/0B8E40A8-D656-4A84-9D7FD45A29B56A45_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0B8E40A8-D656-4A84-9D7FD45A29B56A45_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="1915-07-17">July 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/07-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8088EDC1-465F-4A3E-9B4CBEC02B1B1FB2_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/8088EDC1-465F-4A3E-9B4CBEC02B1B1FB2_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8088EDC1-465F-4A3E-9B4CBEC02B1B1FB2_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="1915-07-17">July 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/07-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B9DF9A8F-4A58-4B59-88C801E1528990E5_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2062supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/B9DF9A8F-4A58-4B59-88C801E1528990E5_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B9DF9A8F-4A58-4B59-88C801E1528990E5_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="1915-07-10">July 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/07-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6CBC9277-03A1-4939-9D94EFCB43552C91_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/6CBC9277-03A1-4939-9D94EFCB43552C91_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6CBC9277-03A1-4939-9D94EFCB43552C91_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="1915-07-10">July 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/07-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4A121787-9A49-465D-A25B80854FBC278F_source.gif?w=600" alt="SA Supplements Vol 80 Issue 2061supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/4A121787-9A49-465D-A25B80854FBC278F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4A121787-9A49-465D-A25B80854FBC278F_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="1915-07-03">July 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/07-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A7C5E0E3-9C5C-40E2-8FE7B9AAADCB8929_source.jpg?w=600" alt="Scientific American Magazine Vol 113 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/A7C5E0E3-9C5C-40E2-8FE7B9AAADCB8929_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A7C5E0E3-9C5C-40E2-8FE7B9AAADCB8929_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="1915-07-03">July 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/06-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FB14E944-2A51-4650-A66D97FF3D0B9ABB_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2060supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/FB14E944-2A51-4650-A66D97FF3D0B9ABB_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FB14E944-2A51-4650-A66D97FF3D0B9ABB_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="1915-06-26">June 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/06-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B26F9347-5704-47E2-8A10DFA3A53A93AF_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 26" srcSet="https://static.scientificamerican.com/sciam/cache/file/B26F9347-5704-47E2-8A10DFA3A53A93AF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B26F9347-5704-47E2-8A10DFA3A53A93AF_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="1915-06-26">June 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/06-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/29CC3625-BF1B-41B2-9B8E4D7AD1D961F8_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 25" srcSet="https://static.scientificamerican.com/sciam/cache/file/29CC3625-BF1B-41B2-9B8E4D7AD1D961F8_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/29CC3625-BF1B-41B2-9B8E4D7AD1D961F8_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="1915-06-19">June 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/06-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A9E0B85A-510E-48A6-97B98438D8803742_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2059supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A9E0B85A-510E-48A6-97B98438D8803742_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A9E0B85A-510E-48A6-97B98438D8803742_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="1915-06-19">June 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/06-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B8E6729C-EDF0-47A6-ACCE52826CBAB81C_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2058supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/B8E6729C-EDF0-47A6-ACCE52826CBAB81C_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B8E6729C-EDF0-47A6-ACCE52826CBAB81C_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="1915-06-12">June 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/06-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/995E064A-7ED2-4229-898306695A5DD7EA_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 24" srcSet="https://static.scientificamerican.com/sciam/cache/file/995E064A-7ED2-4229-898306695A5DD7EA_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/995E064A-7ED2-4229-898306695A5DD7EA_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="1915-06-12">June 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/06-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FA03D299-2006-490B-BB7E62C57A8522EA_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2057supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/FA03D299-2006-490B-BB7E62C57A8522EA_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FA03D299-2006-490B-BB7E62C57A8522EA_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="1915-06-05">June 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/06-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F3D87C05-5923-40CD-83178AD07C4A899C_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 23" srcSet="https://static.scientificamerican.com/sciam/cache/file/F3D87C05-5923-40CD-83178AD07C4A899C_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F3D87C05-5923-40CD-83178AD07C4A899C_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="1915-06-05">June 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/05-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EA3DC10F-C39A-4628-B93DABD47929B689_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 22" srcSet="https://static.scientificamerican.com/sciam/cache/file/EA3DC10F-C39A-4628-B93DABD47929B689_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EA3DC10F-C39A-4628-B93DABD47929B689_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="1915-05-29">May 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/05-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6B4A7092-1044-49AF-AF106980CD7CDB48_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2056supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/6B4A7092-1044-49AF-AF106980CD7CDB48_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6B4A7092-1044-49AF-AF106980CD7CDB48_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="1915-05-29">May 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/05-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6F671AAF-A3F9-4282-80651876CDF82577_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2055supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/6F671AAF-A3F9-4282-80651876CDF82577_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6F671AAF-A3F9-4282-80651876CDF82577_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="1915-05-22">May 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/05-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/37970693-C02A-4FCE-A164546CEE488AE5_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 21" srcSet="https://static.scientificamerican.com/sciam/cache/file/37970693-C02A-4FCE-A164546CEE488AE5_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/37970693-C02A-4FCE-A164546CEE488AE5_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="1915-05-22">May 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/05-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5E62A0EC-F8F8-42CC-A4335D3BFD190D8C_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2054supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/5E62A0EC-F8F8-42CC-A4335D3BFD190D8C_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/5E62A0EC-F8F8-42CC-A4335D3BFD190D8C_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="1915-05-15">May 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/05-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D9393C90-0F01-459E-AFB6934774139BCD_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 20" srcSet="https://static.scientificamerican.com/sciam/cache/file/D9393C90-0F01-459E-AFB6934774139BCD_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D9393C90-0F01-459E-AFB6934774139BCD_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="1915-05-15">May 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/05-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E601192F-75C7-406E-A8B9D28919C081C3_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2053supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/E601192F-75C7-406E-A8B9D28919C081C3_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E601192F-75C7-406E-A8B9D28919C081C3_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="1915-05-08">May 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/05-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B5C6C764-B780-4B14-A16F6F7532A93C17_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 19" srcSet="https://static.scientificamerican.com/sciam/cache/file/B5C6C764-B780-4B14-A16F6F7532A93C17_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B5C6C764-B780-4B14-A16F6F7532A93C17_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="1915-05-08">May 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/ED27F04B-A6A9-48D0-80570C4D3EB2DF75_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2052supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/ED27F04B-A6A9-48D0-80570C4D3EB2DF75_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/ED27F04B-A6A9-48D0-80570C4D3EB2DF75_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="1915-05-01">May 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0BA10436-6666-438E-96BC75AA44F9C046_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 18" srcSet="https://static.scientificamerican.com/sciam/cache/file/0BA10436-6666-438E-96BC75AA44F9C046_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0BA10436-6666-438E-96BC75AA44F9C046_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="1915-05-01">May 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/04-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B073E0C6-BC1A-45BE-8F26F36772FDCF00_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 17" srcSet="https://static.scientificamerican.com/sciam/cache/file/B073E0C6-BC1A-45BE-8F26F36772FDCF00_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B073E0C6-BC1A-45BE-8F26F36772FDCF00_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="1915-04-24">April 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/04-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/681633A2-8FC8-4219-9D1E3BE60A102B4B_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2051supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/681633A2-8FC8-4219-9D1E3BE60A102B4B_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/681633A2-8FC8-4219-9D1E3BE60A102B4B_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="1915-04-24">April 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/04-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B4FFECC7-68EF-4EEC-B45C6A218A9CBBF7_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 16" srcSet="https://static.scientificamerican.com/sciam/cache/file/B4FFECC7-68EF-4EEC-B45C6A218A9CBBF7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B4FFECC7-68EF-4EEC-B45C6A218A9CBBF7_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="1915-04-17">April 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/04-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D6A43C69-AE9B-43CB-8272AE8B87FE9E25_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2050supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/D6A43C69-AE9B-43CB-8272AE8B87FE9E25_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D6A43C69-AE9B-43CB-8272AE8B87FE9E25_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="1915-04-17">April 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/04-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3985A186-FB2D-4837-8A586412C8FD5291_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 15" srcSet="https://static.scientificamerican.com/sciam/cache/file/3985A186-FB2D-4837-8A586412C8FD5291_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3985A186-FB2D-4837-8A586412C8FD5291_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="1915-04-10">April 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/04-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F1102862-17AC-4184-81BE91775F3C4FC2_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2049supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/F1102862-17AC-4184-81BE91775F3C4FC2_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F1102862-17AC-4184-81BE91775F3C4FC2_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="1915-04-10">April 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/04-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C6D264E1-0712-4127-AC78A0AF4E8BE1BE_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2048supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/C6D264E1-0712-4127-AC78A0AF4E8BE1BE_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C6D264E1-0712-4127-AC78A0AF4E8BE1BE_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="1915-04-03">April 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/04-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F71751ED-BEC3-4869-95DC313C9D16BBF0_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 14" srcSet="https://static.scientificamerican.com/sciam/cache/file/F71751ED-BEC3-4869-95DC313C9D16BBF0_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F71751ED-BEC3-4869-95DC313C9D16BBF0_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="1915-04-03">April 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/03-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3939B01F-3480-4881-B48A94CEC90072FD_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 13" srcSet="https://static.scientificamerican.com/sciam/cache/file/3939B01F-3480-4881-B48A94CEC90072FD_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3939B01F-3480-4881-B48A94CEC90072FD_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="1915-03-27">March 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/03-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/77955525-2CE5-4A39-BDABFA4AEACA657F_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2047supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/77955525-2CE5-4A39-BDABFA4AEACA657F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/77955525-2CE5-4A39-BDABFA4AEACA657F_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="1915-03-27">March 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/03-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7F7ABEFF-7027-413F-B0188F376F21F646_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 12" srcSet="https://static.scientificamerican.com/sciam/cache/file/7F7ABEFF-7027-413F-B0188F376F21F646_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7F7ABEFF-7027-413F-B0188F376F21F646_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="1915-03-20">March 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/03-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/DBB0245B-5510-4AD4-8A22036F889E944D_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2046supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/DBB0245B-5510-4AD4-8A22036F889E944D_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/DBB0245B-5510-4AD4-8A22036F889E944D_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="1915-03-20">March 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/03-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B95EE3F2-BD95-4FC1-88E4BA293B4B0044_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 11" srcSet="https://static.scientificamerican.com/sciam/cache/file/B95EE3F2-BD95-4FC1-88E4BA293B4B0044_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B95EE3F2-BD95-4FC1-88E4BA293B4B0044_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="1915-03-13">March 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/03-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/671D7AC0-EC80-40ED-8CBF848B37A41732_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2045supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/671D7AC0-EC80-40ED-8CBF848B37A41732_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/671D7AC0-EC80-40ED-8CBF848B37A41732_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="1915-03-13">March 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1915/03-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/58E866C3-D708-4D1E-9D9FDA73D6460F24_source.jpg?w=600" alt="Scientific American Magazine Vol 112 Issue 10" srcSet="https://static.scientificamerican.com/sciam/cache/file/58E866C3-D708-4D1E-9D9FDA73D6460F24_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/58E866C3-D708-4D1E-9D9FDA73D6460F24_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="1915-03-06">March 1915</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="1915-02-13">February 1915</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1915/02-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2085C635-8D05-4887-88C654E65D24940A_source.gif?w=600" alt="SA Supplements Vol 79 Issue 2041supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/2085C635-8D05-4887-88C654E65D24940A_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2085C635-8D05-4887-88C654E65D24940A_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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