This is a welcome contribution to the diseases of the nervous system from the prolific pen of Prof. Charcot, and a worthy addition to his already numerous volumes on the subject. It is for the most part a record of clinical lectures delivered, and of cases observed, at the Salpêtrière between 1889 and 1891, and reported by M. Georges Guinon, chef de clinique, and other of Prof. Charcot's assistants.