Apoplexies are discussed under three headings: the hemorrhages associated with hypertension, the softening associated with arteriosclerosis and the embolic disorders. A thorough review of the literature is first given by the author. He then discusses the macroscopic localizations of the various types of lesions and shows how they are dependent on the blood supply of the various portions of the brain. The gross and microscopic appearances of the various lesions are described in great detail and the pathogenesis is then discussed. One hundred and fifty excellent illustrations graphically picture his work. The author has written a thorough and adequate description of the apoplexies, the numerous details of which must be studied by any one interested in the subject.