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In the present state of medical knowledge it is impossible for any author to write a textbook even on a single topic. This is well illustrated in the second edition of Hazen's work on syphilis, in which many of the chapters have been written by others. The first edition appeared about ten years ago. There have been many advances in the knowledge of this disease since that time, and this book gives an excellent summary of present knowledge. To neurologists the chief interest is the chapter which deals with involvement of the nervous system. This is obviously written for the dermatologist and not for the neurologist. The chapter dealing with the incidence of syphilis is interesting. It would seem from this that among the hospitalized class of negroes syphilis is about one and a half times as frequent as among the whites. The author makes the statement that there are