A textbook of medicine only eight years old and in its fourth edition is on its record a remarkably vigorous youngster. The Archives has already reviewed the first two editions (Arch. Int. Med. 60:176 [July] 1937; 64:659 [Sept.] 1939). Both reviews were complimentary and said about all that can be said of the fourth edition. The first review welcomed the new book, liked its British flavor and admired its author for his energy, his skilful planning, his facility in writing with clarity and simplicity and his broad understanding and knowledge of disease. The review of the second edition was equally commendatory. The fourth edition hews to the same line. It is an up-to-date model made on the original last. No doubt it will prove as successful as its predecessors.