Mécanisme de la physionomie humaine, ou analyse électro-physiologique de l’expression des passions applicable à la pratique des arts plastiques. Premier fascicule. [All published]. 1 volume of text plus atlas of photographs by Duchenne.

Duchenne studied the mechanism of facial expression during emotion; his atlas of photographs was the first medical book illustrated with photographs of living subjects. Darwin reproduced a number of his photographs in The expression of the emotions (No. 4975).