In the sixteenth lecture, Professor Charcot narrates the history of an epidemic of hysteria occurring in a family which had devoted itself to the vagaries of modern spiritualism. It is very probable that many such instances of the grave forms of hysteria are to be ascribed to practices which tend to impress with awe the imagination of neurotic subjects. In the succeeding lecture the treatment of such cases is discussed, and the importance of isolation is insisted on. Statical electricity and cold baths are also recommended, but the bromides are, according to the author, of no service.