Portrait of Thomas Davidson, from: <cite style="font-style:normal"> (1871). "<a rel="nofollow" class="external text" href="https://archive.org/details/davidson-bio-geologicalmagazi-1818wood">Eminent Living Geologists. Sketch of the Scientific Life of Thomas Davidson</a>". <i>Geological Magazine</i> <b>8</b>: 145-149.</cite>
Not stated
1871-04-30
<a rel="nofollow" class="external free" href="https://archive.org/details/davidson-bio-geologicalmagazi-1818wood/page/n1">https://archive.org/details/davidson-bio-geologicalmagazi-1818wood/page/n1</a>