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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/supplements/1879/12-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/12BB7DE8-E4B8-4EB9-B17A952113EE9FD0_source.gif?w=600" alt="SA Supplements Vol 8 Issue 208supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/12BB7DE8-E4B8-4EB9-B17A952113EE9FD0_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/12BB7DE8-E4B8-4EB9-B17A952113EE9FD0_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="1879-12-27">December 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/12-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2A187BE6-631E-4C39-9F8E225355B33D4E_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 26" srcSet="https://static.scientificamerican.com/sciam/cache/file/2A187BE6-631E-4C39-9F8E225355B33D4E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2A187BE6-631E-4C39-9F8E225355B33D4E_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="1879-12-27">December 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/12-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/492B6D3E-0880-44F1-9FA6FA1A8448E55F_source.gif?w=600" alt="SA Supplements Vol 8 Issue 207supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/492B6D3E-0880-44F1-9FA6FA1A8448E55F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/492B6D3E-0880-44F1-9FA6FA1A8448E55F_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="1879-12-20">December 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/12-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E1DDF740-E3C4-4C39-B303C1D257CE0C7F_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 25" srcSet="https://static.scientificamerican.com/sciam/cache/file/E1DDF740-E3C4-4C39-B303C1D257CE0C7F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E1DDF740-E3C4-4C39-B303C1D257CE0C7F_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="1879-12-20">December 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/12-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/58C72B77-5FEF-4EEA-920B45E2C5D457F4_source.gif?w=600" alt="SA Supplements Vol 8 Issue 206supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/58C72B77-5FEF-4EEA-920B45E2C5D457F4_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/58C72B77-5FEF-4EEA-920B45E2C5D457F4_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="1879-12-13">December 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/12-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C23776C9-23D0-4D2C-B180A6841497E0DA_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 24" srcSet="https://static.scientificamerican.com/sciam/cache/file/C23776C9-23D0-4D2C-B180A6841497E0DA_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C23776C9-23D0-4D2C-B180A6841497E0DA_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="1879-12-13">December 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/12-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A165D4A2-3FCC-4C52-B0DAC45B4DBB6FB6_source.gif?w=600" alt="SA Supplements Vol 8 Issue 205supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A165D4A2-3FCC-4C52-B0DAC45B4DBB6FB6_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A165D4A2-3FCC-4C52-B0DAC45B4DBB6FB6_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="1879-12-06">December 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/12-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8B087B3D-190E-41D4-9716091A9CA32543_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 23" srcSet="https://static.scientificamerican.com/sciam/cache/file/8B087B3D-190E-41D4-9716091A9CA32543_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8B087B3D-190E-41D4-9716091A9CA32543_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="1879-12-06">December 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/11-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8E3754B7-310E-4944-8201B4BA75E70354_source.gif?w=600" alt="SA Supplements Vol 8 Issue 204supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/8E3754B7-310E-4944-8201B4BA75E70354_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8E3754B7-310E-4944-8201B4BA75E70354_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="1879-11-29">November 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/11-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0289DF30-B8BF-4744-A4E935A869A4C9A9_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 22" srcSet="https://static.scientificamerican.com/sciam/cache/file/0289DF30-B8BF-4744-A4E935A869A4C9A9_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0289DF30-B8BF-4744-A4E935A869A4C9A9_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="1879-11-29">November 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/11-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EBCA0599-6162-4413-A65F7EFC05FEEAA8_source.gif?w=600" alt="SA Supplements Vol 8 Issue 203supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/EBCA0599-6162-4413-A65F7EFC05FEEAA8_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EBCA0599-6162-4413-A65F7EFC05FEEAA8_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="1879-11-22">November 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/11-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D9FF9B6D-6CD5-4243-A8C4699BB8D6966E_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 21" srcSet="https://static.scientificamerican.com/sciam/cache/file/D9FF9B6D-6CD5-4243-A8C4699BB8D6966E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D9FF9B6D-6CD5-4243-A8C4699BB8D6966E_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="1879-11-22">November 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/11-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EFBEDEAF-31A7-4F77-A02E5F56B916890C_source.gif?w=600" alt="SA Supplements Vol 8 Issue 202supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/EFBEDEAF-31A7-4F77-A02E5F56B916890C_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EFBEDEAF-31A7-4F77-A02E5F56B916890C_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="1879-11-15">November 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/11-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F08E04B5-8669-47E0-8C73FC456C8295E7_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 20" srcSet="https://static.scientificamerican.com/sciam/cache/file/F08E04B5-8669-47E0-8C73FC456C8295E7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F08E04B5-8669-47E0-8C73FC456C8295E7_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="1879-11-15">November 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/11-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/78E28D79-A442-408B-9F012BBFC944CB37_source.gif?w=600" alt="SA Supplements Vol 8 Issue 201supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/78E28D79-A442-408B-9F012BBFC944CB37_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="1879-11-08">November 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FD145E89-052B-4777-B80E38553E22BD8F_source.gif?w=600" alt="SA Supplements Vol 8 Issue 200supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/FD145E89-052B-4777-B80E38553E22BD8F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FD145E89-052B-4777-B80E38553E22BD8F_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="1879-11-01">November 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9B403825-DCF0-4CCF-88766D0B9D59EE1F_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 18" srcSet="https://static.scientificamerican.com/sciam/cache/file/9B403825-DCF0-4CCF-88766D0B9D59EE1F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9B403825-DCF0-4CCF-88766D0B9D59EE1F_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="1879-11-01">November 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/10-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F334E3D6-18E3-48E3-AB7D74A1E97FF375_source.gif?w=600" alt="SA Supplements Vol 8 Issue 199supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/F334E3D6-18E3-48E3-AB7D74A1E97FF375_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F334E3D6-18E3-48E3-AB7D74A1E97FF375_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="1879-10-25">October 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/10-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B3A83D7D-88F1-43F7-B199CB3F09D8DFF6_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 17" srcSet="https://static.scientificamerican.com/sciam/cache/file/B3A83D7D-88F1-43F7-B199CB3F09D8DFF6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B3A83D7D-88F1-43F7-B199CB3F09D8DFF6_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="1879-10-25">October 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/10-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/03825771-05B3-4E90-9B15E5D7413C615E_source.gif?w=600" alt="SA Supplements Vol 8 Issue 198supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/03825771-05B3-4E90-9B15E5D7413C615E_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/03825771-05B3-4E90-9B15E5D7413C615E_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="1879-10-18">October 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/10-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/DB391502-4737-4033-9F0CA276E7E2C6DC_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 16" srcSet="https://static.scientificamerican.com/sciam/cache/file/DB391502-4737-4033-9F0CA276E7E2C6DC_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/DB391502-4737-4033-9F0CA276E7E2C6DC_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="1879-10-18">October 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/10-11/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/95A0533D-F7E1-4E9C-BDC106A8664E3F40_source.gif?w=600" alt="SA Supplements Vol 8 Issue 197supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/95A0533D-F7E1-4E9C-BDC106A8664E3F40_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="1879-10-11">October 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/10-04/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/044ED23D-544D-4D2A-8A57304F7EF95CA5_source.gif?w=600" alt="SA Supplements Vol 8 Issue 196supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/044ED23D-544D-4D2A-8A57304F7EF95CA5_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/044ED23D-544D-4D2A-8A57304F7EF95CA5_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="1879-10-04">October 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/10-04/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EBB4B1C5-3A44-4C55-B9C76A7D450E5517_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 14" srcSet="https://static.scientificamerican.com/sciam/cache/file/EBB4B1C5-3A44-4C55-B9C76A7D450E5517_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EBB4B1C5-3A44-4C55-B9C76A7D450E5517_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="1879-10-04">October 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/09-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E038F6A2-6BD8-4AAC-AC499B2A156327C9_source.gif?w=600" alt="SA Supplements Vol 8 Issue 195supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/E038F6A2-6BD8-4AAC-AC499B2A156327C9_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E038F6A2-6BD8-4AAC-AC499B2A156327C9_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="1879-09-27">September 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/09-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img 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src="https://static.scientificamerican.com/sciam/cache/file/94821628-5717-4193-B6AE62ACBEA3AD39_source.gif?w=600" alt="SA Supplements Vol 8 Issue 194supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/94821628-5717-4193-B6AE62ACBEA3AD39_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/94821628-5717-4193-B6AE62ACBEA3AD39_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="1879-09-20">September 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/09-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A6632B62-6EB2-4CB9-BBDF58B79E199FA2_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 12" srcSet="https://static.scientificamerican.com/sciam/cache/file/A6632B62-6EB2-4CB9-BBDF58B79E199FA2_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A6632B62-6EB2-4CB9-BBDF58B79E199FA2_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="1879-09-20">September 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/09-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CA1B6626-4788-4C32-B56F302DCE2119A6_source.gif?w=600" alt="SA Supplements Vol 8 Issue 193supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/CA1B6626-4788-4C32-B56F302DCE2119A6_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CA1B6626-4788-4C32-B56F302DCE2119A6_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="1879-09-13">September 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/09-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9E308EB4-0617-4183-9B2E966B2438913C_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 11" srcSet="https://static.scientificamerican.com/sciam/cache/file/9E308EB4-0617-4183-9B2E966B2438913C_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9E308EB4-0617-4183-9B2E966B2438913C_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="1879-09-13">September 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/09-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D706C161-01C8-4E1E-B18D6162A9896E87_source.gif?w=600" alt="SA Supplements Vol 8 Issue 192supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/D706C161-01C8-4E1E-B18D6162A9896E87_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D706C161-01C8-4E1E-B18D6162A9896E87_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="1879-09-06">September 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/09-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4F49B6C0-A66B-4CAF-864D3EBC2C0A4DF6_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 10" srcSet="https://static.scientificamerican.com/sciam/cache/file/4F49B6C0-A66B-4CAF-864D3EBC2C0A4DF6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4F49B6C0-A66B-4CAF-864D3EBC2C0A4DF6_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="1879-09-06">September 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/08-30/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/21010231-8B3A-487E-8EB3AD3EF10311B6_source.gif?w=600" alt="SA Supplements Vol 8 Issue 191supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/21010231-8B3A-487E-8EB3AD3EF10311B6_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/21010231-8B3A-487E-8EB3AD3EF10311B6_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="1879-08-30">August 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/08-30/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/80CCAD15-623D-42F8-B4C1F87D8B0C421E_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 9" srcSet="https://static.scientificamerican.com/sciam/cache/file/80CCAD15-623D-42F8-B4C1F87D8B0C421E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/80CCAD15-623D-42F8-B4C1F87D8B0C421E_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="1879-08-30">August 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/08-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/04A15C22-646F-4793-860F013762EE16EF_source.gif?w=600" alt="SA Supplements Vol 8 Issue 190supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/04A15C22-646F-4793-860F013762EE16EF_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/04A15C22-646F-4793-860F013762EE16EF_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="1879-08-23">August 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/08-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0E8F4A61-9F07-4F57-A59BE6F543800EFE_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 8" srcSet="https://static.scientificamerican.com/sciam/cache/file/0E8F4A61-9F07-4F57-A59BE6F543800EFE_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0E8F4A61-9F07-4F57-A59BE6F543800EFE_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="1879-08-23">August 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/08-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0466ED79-F443-4BB5-9D34E7C40BF6F3C5_source.gif?w=600" alt="SA Supplements Vol 8 Issue 189supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/0466ED79-F443-4BB5-9D34E7C40BF6F3C5_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0466ED79-F443-4BB5-9D34E7C40BF6F3C5_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="1879-08-16">August 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/08-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/07251020-8750-4794-AB00DA8F930AC929_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 7" srcSet="https://static.scientificamerican.com/sciam/cache/file/07251020-8750-4794-AB00DA8F930AC929_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/07251020-8750-4794-AB00DA8F930AC929_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="1879-08-16">August 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/08-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/38669574-02CC-4412-ABB0AD6FFB2713CF_source.gif?w=600" alt="SA Supplements Vol 8 Issue 188supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/38669574-02CC-4412-ABB0AD6FFB2713CF_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/38669574-02CC-4412-ABB0AD6FFB2713CF_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="1879-08-09">August 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/08-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0409B343-1B89-42AB-A4F03FF12ECCFAA2_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/0409B343-1B89-42AB-A4F03FF12ECCFAA2_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0409B343-1B89-42AB-A4F03FF12ECCFAA2_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="1879-08-09">August 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/08-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3985DB9C-F9EC-4BC9-BFE023EF807E1BFB_source.gif?w=600" alt="SA Supplements Vol 8 Issue 187supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/3985DB9C-F9EC-4BC9-BFE023EF807E1BFB_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3985DB9C-F9EC-4BC9-BFE023EF807E1BFB_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="1879-08-02">August 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/08-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C3E6079D-2C5C-4EB8-8E05EB6CB41EC549_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/C3E6079D-2C5C-4EB8-8E05EB6CB41EC549_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C3E6079D-2C5C-4EB8-8E05EB6CB41EC549_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="1879-08-02">August 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/07-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F3F6C110-1E35-457F-824C9F69ADBE4B2E_source.gif?w=600" alt="SA Supplements Vol 8 Issue 186supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/F3F6C110-1E35-457F-824C9F69ADBE4B2E_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F3F6C110-1E35-457F-824C9F69ADBE4B2E_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="1879-07-26">July 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/07-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0D12123D-DC80-4230-867E3E5D2B1389BA_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/0D12123D-DC80-4230-867E3E5D2B1389BA_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0D12123D-DC80-4230-867E3E5D2B1389BA_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="1879-07-26">July 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/07-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2D255A32-7E5F-4A5F-9452B61204098982_source.gif?w=600" alt="SA Supplements Vol 8 Issue 185supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/2D255A32-7E5F-4A5F-9452B61204098982_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2D255A32-7E5F-4A5F-9452B61204098982_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="1879-07-19">July 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/07-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CC986F3E-D47D-4BA8-B2A89EB8E93859CF_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/CC986F3E-D47D-4BA8-B2A89EB8E93859CF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CC986F3E-D47D-4BA8-B2A89EB8E93859CF_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="1879-07-19">July 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/07-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/54659A87-07C2-498A-BF1100FBA8A799D1_source.gif?w=600" alt="SA Supplements Vol 8 Issue 184supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/54659A87-07C2-498A-BF1100FBA8A799D1_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/54659A87-07C2-498A-BF1100FBA8A799D1_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="1879-07-12">July 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/07-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A83D1D83-A97C-4465-B6501E1AD0D3A688_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/A83D1D83-A97C-4465-B6501E1AD0D3A688_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A83D1D83-A97C-4465-B6501E1AD0D3A688_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="1879-07-12">July 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/07-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1D5B9748-9BA9-43E1-B91E74671D15211D_source.gif?w=600" alt="SA Supplements Vol 8 Issue 183supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/1D5B9748-9BA9-43E1-B91E74671D15211D_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1D5B9748-9BA9-43E1-B91E74671D15211D_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="1879-07-05">July 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/07-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BFC85102-6966-4939-975E53DC572BC5E1_source.jpg?w=600" alt="Scientific American Magazine Vol 41 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/BFC85102-6966-4939-975E53DC572BC5E1_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BFC85102-6966-4939-975E53DC572BC5E1_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="1879-07-05">July 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/06-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1094C68E-DAF0-489A-B2059901DA8FB144_source.gif?w=600" alt="SA Supplements Vol 7 Issue 182supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/1094C68E-DAF0-489A-B2059901DA8FB144_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1094C68E-DAF0-489A-B2059901DA8FB144_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="1879-06-28">June 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/06-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/207F1659-819B-400B-ACFE149B620B62BD_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 26" srcSet="https://static.scientificamerican.com/sciam/cache/file/207F1659-819B-400B-ACFE149B620B62BD_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/207F1659-819B-400B-ACFE149B620B62BD_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="1879-06-28">June 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/06-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/502876D9-AD94-4867-A9CAA32AC08F4AF7_source.gif?w=600" alt="SA Supplements Vol 7 Issue 181supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/502876D9-AD94-4867-A9CAA32AC08F4AF7_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/502876D9-AD94-4867-A9CAA32AC08F4AF7_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="1879-06-21">June 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/06-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9EFCE1EE-346E-415A-940C18BC3DAB76EA_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 25" srcSet="https://static.scientificamerican.com/sciam/cache/file/9EFCE1EE-346E-415A-940C18BC3DAB76EA_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9EFCE1EE-346E-415A-940C18BC3DAB76EA_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="1879-06-21">June 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/06-14/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/661A2EBB-3D1E-4475-A25EE9FCAA93EB2A_source.gif?w=600" alt="SA Supplements Vol 7 Issue 180supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/661A2EBB-3D1E-4475-A25EE9FCAA93EB2A_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/661A2EBB-3D1E-4475-A25EE9FCAA93EB2A_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="1879-06-14">June 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/06-14/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/06E9DC59-41A2-4734-97F66AD81ADFBFBB_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 24" srcSet="https://static.scientificamerican.com/sciam/cache/file/06E9DC59-41A2-4734-97F66AD81ADFBFBB_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/06E9DC59-41A2-4734-97F66AD81ADFBFBB_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="1879-06-14">June 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/06-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0FFEEF65-A527-447C-ACC5E493865FE2CE_source.gif?w=600" alt="SA Supplements Vol 7 Issue 179supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/0FFEEF65-A527-447C-ACC5E493865FE2CE_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0FFEEF65-A527-447C-ACC5E493865FE2CE_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="1879-06-07">June 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/06-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/ABE1C13C-33DC-40B3-91DBE51566631A16_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 23" srcSet="https://static.scientificamerican.com/sciam/cache/file/ABE1C13C-33DC-40B3-91DBE51566631A16_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/ABE1C13C-33DC-40B3-91DBE51566631A16_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="1879-06-07">June 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/05-31/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F1D16D0C-9DC6-4F5A-99312AE76DAB6EA7_source.gif?w=600" alt="SA Supplements Vol 7 Issue 178supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/F1D16D0C-9DC6-4F5A-99312AE76DAB6EA7_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F1D16D0C-9DC6-4F5A-99312AE76DAB6EA7_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="1879-05-31">May 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/05-31/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/73DB3705-6200-47BA-9536A08B405A5F72_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 22" srcSet="https://static.scientificamerican.com/sciam/cache/file/73DB3705-6200-47BA-9536A08B405A5F72_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/73DB3705-6200-47BA-9536A08B405A5F72_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="1879-05-31">May 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/05-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BBCBB774-F9B1-4040-B1735242A8DF3449_source.gif?w=600" alt="SA Supplements Vol 7 Issue 177supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/BBCBB774-F9B1-4040-B1735242A8DF3449_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BBCBB774-F9B1-4040-B1735242A8DF3449_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="1879-05-24">May 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/05-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1A434EB2-3206-48CC-AF42F0BF5AEE1841_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 21" srcSet="https://static.scientificamerican.com/sciam/cache/file/1A434EB2-3206-48CC-AF42F0BF5AEE1841_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1A434EB2-3206-48CC-AF42F0BF5AEE1841_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="1879-05-24">May 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/05-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/042CAD5B-653D-402F-A75A254383859E69_source.gif?w=600" alt="SA Supplements Vol 7 Issue 176supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/042CAD5B-653D-402F-A75A254383859E69_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/042CAD5B-653D-402F-A75A254383859E69_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="1879-05-17">May 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/05-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A1E93BAF-237F-4106-95722AF155B62803_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 20" srcSet="https://static.scientificamerican.com/sciam/cache/file/A1E93BAF-237F-4106-95722AF155B62803_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A1E93BAF-237F-4106-95722AF155B62803_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="1879-05-17">May 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/05-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A1D1A155-18A3-4B94-81E62E1771878AB4_source.gif?w=600" alt="SA Supplements Vol 7 Issue 175supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A1D1A155-18A3-4B94-81E62E1771878AB4_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A1D1A155-18A3-4B94-81E62E1771878AB4_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="1879-05-10">May 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/05-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EB21650F-6AF6-47E0-B723E908C65E18F6_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 19" srcSet="https://static.scientificamerican.com/sciam/cache/file/EB21650F-6AF6-47E0-B723E908C65E18F6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EB21650F-6AF6-47E0-B723E908C65E18F6_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="1879-05-10">May 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/05-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8E8BB64A-8A63-4984-87DC854A0FD96103_source.gif?w=600" alt="SA Supplements Vol 7 Issue 174supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/8E8BB64A-8A63-4984-87DC854A0FD96103_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8E8BB64A-8A63-4984-87DC854A0FD96103_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="1879-05-03">May 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/05-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/22E35ADA-49F3-4623-BD39804308A13065_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 18" srcSet="https://static.scientificamerican.com/sciam/cache/file/22E35ADA-49F3-4623-BD39804308A13065_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/22E35ADA-49F3-4623-BD39804308A13065_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="1879-05-03">May 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/04-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9801D194-85EE-4DF1-BCBA29B613EEC4E4_source.gif?w=600" alt="SA Supplements Vol 7 Issue 173supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/9801D194-85EE-4DF1-BCBA29B613EEC4E4_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9801D194-85EE-4DF1-BCBA29B613EEC4E4_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="1879-04-26">April 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/04-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6FEB08B9-2E31-4F8E-8A0AF55D9669F42E_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 17" srcSet="https://static.scientificamerican.com/sciam/cache/file/6FEB08B9-2E31-4F8E-8A0AF55D9669F42E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6FEB08B9-2E31-4F8E-8A0AF55D9669F42E_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="1879-04-26">April 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/04-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/14813E4E-086D-4CA7-8BCA956D31E83ECA_source.gif?w=600" alt="SA Supplements Vol 7 Issue 172supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/14813E4E-086D-4CA7-8BCA956D31E83ECA_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/14813E4E-086D-4CA7-8BCA956D31E83ECA_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="1879-04-19">April 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/04-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1FDE03D7-AAA5-4DD1-ABFA9FA7C7A1A0E3_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 16" srcSet="https://static.scientificamerican.com/sciam/cache/file/1FDE03D7-AAA5-4DD1-ABFA9FA7C7A1A0E3_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1FDE03D7-AAA5-4DD1-ABFA9FA7C7A1A0E3_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="1879-04-19">April 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/04-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1E90DC09-78D0-4E6A-A0E4F6499EC6339E_source.gif?w=600" alt="SA Supplements Vol 7 Issue 171supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/1E90DC09-78D0-4E6A-A0E4F6499EC6339E_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1E90DC09-78D0-4E6A-A0E4F6499EC6339E_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="1879-04-12">April 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/04-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6843C5CE-FC12-4125-A2AF0D5BBB71AC8A_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 15" srcSet="https://static.scientificamerican.com/sciam/cache/file/6843C5CE-FC12-4125-A2AF0D5BBB71AC8A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6843C5CE-FC12-4125-A2AF0D5BBB71AC8A_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="1879-04-12">April 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/04-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A914FF06-88B1-4B22-8D4FF041D7EAA89B_source.gif?w=600" alt="SA Supplements Vol 7 Issue 170supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A914FF06-88B1-4B22-8D4FF041D7EAA89B_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A914FF06-88B1-4B22-8D4FF041D7EAA89B_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="1879-04-05">April 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/04-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0FD495B3-E38A-430E-B840206BC0D9A82F_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 14" srcSet="https://static.scientificamerican.com/sciam/cache/file/0FD495B3-E38A-430E-B840206BC0D9A82F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0FD495B3-E38A-430E-B840206BC0D9A82F_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="1879-04-05">April 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/03-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/73990933-EF20-432E-AAA53B8A3C7C8569_source.gif?w=600" alt="SA Supplements Vol 7 Issue 169supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/73990933-EF20-432E-AAA53B8A3C7C8569_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="1879-03-29">March 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/03-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CC04F2E5-CC17-49DA-B2E927FFECD1D9D2_source.gif?w=600" alt="SA Supplements Vol 7 Issue 168supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/CC04F2E5-CC17-49DA-B2E927FFECD1D9D2_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CC04F2E5-CC17-49DA-B2E927FFECD1D9D2_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="1879-03-22">March 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/03-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B68EA9B8-8FCE-45A6-B075139043660EB3_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 12" srcSet="https://static.scientificamerican.com/sciam/cache/file/B68EA9B8-8FCE-45A6-B075139043660EB3_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B68EA9B8-8FCE-45A6-B075139043660EB3_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="1879-03-22">March 1879</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="1879-03-01">March 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/02-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CA131667-54B0-4E73-8947A8C7C6745B89_source.gif?w=600" alt="SA Supplements Vol 7 Issue 164supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/CA131667-54B0-4E73-8947A8C7C6745B89_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CA131667-54B0-4E73-8947A8C7C6745B89_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="1879-02-22">February 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/02-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C60D467E-42EF-4BB9-8B2B2DB8ABFF4A23_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 8" srcSet="https://static.scientificamerican.com/sciam/cache/file/C60D467E-42EF-4BB9-8B2B2DB8ABFF4A23_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C60D467E-42EF-4BB9-8B2B2DB8ABFF4A23_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="1879-02-22">February 1879</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="1879-02-01">February 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1879/01-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/55B3F2E7-E198-467B-A34CBBDEA35DCF82_source.gif?w=600" alt="SA Supplements Vol 7 Issue 160supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/55B3F2E7-E198-467B-A34CBBDEA35DCF82_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/55B3F2E7-E198-467B-A34CBBDEA35DCF82_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="1879-01-25">January 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1879/01-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D878A6FB-FD32-48DD-9E0142761378A51A_source.jpg?w=600" alt="Scientific American Magazine Vol 40 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/D878A6FB-FD32-48DD-9E0142761378A51A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D878A6FB-FD32-48DD-9E0142761378A51A_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="1879-01-25">January 1879</time></div></div></div></a></div><div class="list__item--tR3J"><a 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