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It is interesting to see that Dr. Mackie has found it advisable to have numerous collaborators; the field has become so specialized that this is really unavoidable. The present volume is an outgrowth, or second edition, of that written during the last war, with special emphasis on the needs of the Armed Forces. The general spirit of the original edition has been preserved. The discussions are to the point and up-to-date. There are innumerable excellent photographs and diagrams. There are no references to the literature, but the book is already one of 900 pages and so it is probably wise not to clutter it with a bibliography. The clear and precise directions about therapy are a specially valuable feature.