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This is quite similar in general content and arrangement of material to the previous edition. The changes are scarcely apparent if one casually examines the book, but a perusal of the text will show that a considerable number have been effected without altering the appearance of the book to any great extent. The author has tried to bring his work to date by the addition of material on the more recent important advances in the subject. In this, of course, he is only partially successful, because of the rapidity with which knowledge in the biologic sciences now increases. In general, the discussion of new material is brief, but considerable space is given to the recent work on the structure of the blood and bile pigments, the nucleic acids, and the chemistry of glandular products and vitamins. The lists of references that accompany each chapter have been completed to 1930. The