It is unfortunate that there are not more compilations of the sort presented in this book. Students of medicine and its related sciences are aided immeasurably by the reading of original investigations. It brings to them the realization that young men have made important contributions and it will aid them in avoiding the pitfalls of faulty observation. The material has been grouped under the headings of circulation, digestion, respiration, the muscles and peripheral nerves and the central nervous system. The book does not represent a history of physiology but is rather a source book. Consequently there is not a continuous story of the development of a certain subject or the occurrences of a definite period. The illustrations have been carefully chosen and are not time-worn from too frequent reproduction. The introductory material prepared by the editor adds greatly to the interest of the book.