Featured on PDR in the essay The Naturalist and the Neurologist: On Charles Darwin and James Crichton-Browne

Stassa Edwards explores Charles Darwin's photography collection, which includes almost forty portraits of mental patients given to him by the neurologist James Crichton-Browne. The study of these photographs, and the related correspondence between the two men, would prove instrumental in the development of The Expression of the Emotions in Man and Animals (1872), Darwin's book on the evolution of emotions.