Image of Charles Frédéric Kuhlmann, adapted from a photo, apparently an etching.
Artist not known. Photographer not known. Image from books.google.com, screen-captured
<i>La nature</i>, 1881 February 26, page 195, scanned at <a rel="nofollow" class="external text" href="https://books.google.com/books?id=cn0AAAAAMAAJ&amp;lpg=PA190&amp;ots=6UxCDNR44U&amp;dq=Societ%C3%A9%20Veg%C3%A9tarienne%20de%20Paris%20Villeneuve&amp;pg=PA193#v=onepage&amp;q&amp;f=false">google books</a>