The second edition of this work is improved by thorough revision of the sections on the chemistry of the proteids, the chemistry of digestion, the movements of the intestines, the production of lymph, the nerve mechanism of the heart, and the physiology of vision. In the section on the movements of the intestines the author refers to the investigations by Cannon by means of the Roentgen rays and the fluoroscope. Of the production of lymph from the blood and its diffusion he admits that the last word has not been said. The present edition reflects fairly the present state of knowledge and commends itself to all who are interested in the subject, whether as teachers. students or practitioners.