The preparation of a textbook for undergraduate instruction in radiologic diagnosis requires much care. As with many other specialties, the undergraduate course in radiology can hope to accomplish little more than to give students a bird's eye view of the field of radiology, acquainting them with the possibilities of radiologic diagnosis and with the characteristics of an adequate x-ray study in the more common applications of diagnostic x-ray. The medical curriculum has become so crowded that the teacher of radiology finds it difficult to secure enough hours for didactic work to give the student more than an introduction to radiology. Holmes and Robbins in this admirable textbook have succeeded in providing an ideal vehicle for imparting a basic understanding of radiologic diagnosis. Many larger books have been written, some of them voluminous. Few have expressed so much, so well in such brief space.