Picture of Amedeo Avogadro (1776–1856), the Italian scientist
From a drawing by C. Sentier, executed in Torino at Litografia Doyen in 1856.
1856
<a rel="nofollow" class="external text" href="http://dewey.library.upenn.edu/sceti/smith/scientist.cfm?PictureID=26&amp;ScientistID=24&amp;CFID=20071562&amp;CFTOKEN=19304358">Edgar Fahs Smith collection</a>