This fourth volume of Allchin's manual contains the diseases of the respiratory and circulatory systems. The authors' names, which are a guarantee in their way of the merit of the articles, are Drs. J. Mitchell Bruce on diseases of the heart and blood vessels, Dr. Francis de Havilland Hall on diseases of the pleura, Dr. Leonard Hill on physiology of respiration and circulation, Dr. Hector MacKenzie on diseases of the lower respiratory tract, Dr. Lewis Smith on disorders of the upper respiratory tract, and the editor on disorders of the diaphragm and dropsy. While the book in its treatment of the subjects is often brief, yet the articles are of a quality that can not be criticised, and the illustrations, skiagraphs, etc., are well selected and instructive. The volume seems to us to keep up the reputation of the work as a whole to its full extent.