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The immense and rapidly increasing literature on the subjects considered in this book, the novelty of many of the discoveries and the complexity of terminology make commendable efforts at a connected account of the present situation. From his own participation in the subject and his success as a bookmaker, the author of this work was justified in undertaking it. On the whole, he may be congratulated on his success. He has given a fairly adequate view of the theory and practice of the subject. It is especially true of the more ``practical'' chapters, for in the introductory part the author indulges in a fancy for splitting hairs and for obiter dicta. Thus, it seems unnecessary to exalt immunity studies by emphasizing the imperfection of previous knowledge. The folly of such a course is well illustrated when, after the trite and overworked emphasis on the imperfections of art, the