This volume, first offered to the public in 1911, is now in its twenty-fifth year. Its success is obvious. The new edition takes account of changes in the Pharmacopeia as to definition and spelling and attempts also to lead medical users into a gradual reformation in spelling. The editor indicates in his preface the difficulties that he himself is having with anatomic terms. This dictionary, unlike others, begins with a section devoted to medical etymology, which is planned to show users the manner of origin of most of the terms used in medical science. The dictionary is nicely illustrated with excellent plates. It is supplemented by numerous tables, giving a great deal of concentrated information, and is altogether one of the most useful medical dictionaries that are published.