Each edition of this great medical dictionary extends its wide reputation. This edition has thousands of new terms that have been added to medical language and many new illustrations. The new typography makes it more readable. Other new features are a table of modern drugs and dosage and an article on fundamentals of medical etymology, which was prepared by Prof. Lloyd Daly, of the University of Pennsylvania. This edition appeared during the celebration of the semicentennial of this medical dictionary. The publishers are to be congratulated.