This edition appears two years after the preceding and occupies twenty-nine more pages, a part of which increase is due to printing in larger type the material formerly put in 8 point type. There are eleven more illustrations than in the earlier edition. The number of tables remains unchanged at thirty-six. Most of the textual matter is unchanged, but with the addition of a second author a few new paragraphs have been added and others rewritten; however, in the main, the book is not radically altered. It is still a useful textbook for elementary and intermediate students of physiology. The style is in general direct and simple. At some points a considerable biochemical background is presupposed in the reader, and elsewhere no knowledge whatever. The printing is excellent and typographic errors are few.