It is impossible in any short review to give an adequate conception of the rich material in this monograph or of the clear, simple method of presentation. In general, the work deals with the more intricate aspects of the physicochemistry of living tissues. It is a simplified analysis of the significant relations between chemical structure and physiologic action. The chapter headings include such subjects as enzymes, oxidations, liver in relation to protein, fat and carbohydrate, kidney, muscle, nerve, endocrines and vitamins. There is also considerable discussion of the importance of electrolytes. It is a remarkable accomplishment that so much sound, scientific discussion is encompassed within such small space. Unfortunately there is no bibliography.