Afterwards he studied bacteriology with Pierre Paul Émile Roux at the Pasteur Institute.

In 1894 he received his doctorate, and he later served as chief of Jean Alfred Fournier's laboratory at the Hôpital Saint-Louis.

[1] He invented a method to select fungi with a medium of low pH and a rather high concentration of sugar.

[2] With Ferdinand-Jean Darier (1856–1938) and Henri Gougerot (1881–1955), he was the editor of an eight-volume encyclopedia of dermatology titled Nouvelle Pratique Dermatologique.

His Manuel élémentaire de dermatologie topographique régionale (1905), was translated into English and published as Elementary Manual of Regional Topographical Dermatology (1906), and several years later re-published as A Manual of Regional Topographical Dermatology (1912).