<div class="description">
Published photograph of the only known daguerreotype of Charles Darwin</div>
<div class="fn value">
Unknown</div>
<cite class="book" style="font-style:normal"><a href="https://en.wikipedia.org/wiki/Karl_Pearson" class="extiw" title="w:Karl Pearson">Karl Pearson</a> (1914)      <i> <a rel="nofollow" class="external text" href="https://archive.org/stream/palifeletterslab03pearuoft#page/340/mode/2up">The life, letters and labours of Francis Galton</a></i>, IIIa, <a href="https://en.wikipedia.org/wiki/en:Cambridge" class="extiw" title="w:en:Cambridge"><span title="city in Cambridgeshire, England">Cambridge</span></a>:  University press, p. 341  <small><a href="https://en.wikipedia.org/wiki/Online_Computer_Library_Center" class="extiw" title="en:Online Computer Library Center">OCLC</a>:   <a rel="nofollow" class="external text" href="https://www.worldcat.org/oclc/873074079">873074079</a>. </small></cite>