The new fifth edition of Cecil's "Textbook of Medicine" seems to establish the book definitely as one of the institutions of American medicine. Compressed into relatively brief space one finds a miniature system with concise but authoritative articles by men whose names for the most part are outstanding in their fields. It would take too much space to discuss individual sections, but the editor is to be congratulated on the character of the present revision, in which a good many articles have been entirely rewritten, sometimes by a new man. While a book of this sort lacks in a sense the homogeneous viewpoint of a single writer, it must be admitted, even if with regret, that no one man can any longer cover the subject with authority. The reviewer finds himself constantly using Cecil for rapid reference, and usually with satisfaction.