A photograph of Charles Darwin by Herbert Rose Barraud (1845 - 1896) taken in 1881, thought to be the last photograph of Darwin before his death.  The original is in <a href="https://en.wikipedia.org/wiki/The_Huntington_Library" class="extiw" title="w:The Huntington Library">The Huntington Library</a>.
Herbert Rose Barraud (1845 - 1896)
1881
<a rel="nofollow" class="external text" href="http://inside.msj.edu/academics/faculty/kritskg/kritskysciam.pdf">Charles Darwin: The Last Portrait</a>, <i>Scientific American</i>, November 1995, pp. 78-79