The systems of medicine published by the Prior Company already include Tice's Practice of Medicine, Lewis's Practice of Surgery, the Practice of Physical Therapy, Gynecology and Obstetrics, and now comes the Practice of Pediatrics, edited by Dr. Joseph Brennemann, chief of staff of the Children's Memorial Hospital, Chicago. In its make-up, printing, looseleaf form and other significant typographic aspects, Brennemann's Pediatrics resembles the previously published systems. It has a total of more than a hundred contributors. It differs, of course, from the several previously published systems of pediatrics in being the first in a loose-leaf form. It is planned particularly for the general practitioner and the student rather than for the specialist. It gives perhaps more attention to treatment than has been given by previous systems of pediatrics. The hundred contributors include numbers of American pediatricians, immunologists, psychiatrists, hygienists and other specialists who have been interested in pediatrics.