Textbook of Pediatric Rheumatology, by James T. Cassidy, 684 pp, with illus, $47.50, New York, John Wiley & Sons Inc, 1982. Rapid recent developments in rheumatology have demanded new books about rheumatic manifestations in children. The venerable books of Brewer and Grokoest drew attention to the specialty of pediatric rheumatology some years ago and served to excite the interest of pediatricians and internists alike in choosing a subspecialty. In some centers, pediatric rheumatologists provide expertise, in other centers, rheumatologists divide their interests between adult and childhood rheumatic disorders. We are now treated to the almost simultaneous appearance of two new textbooks. One, by Jacobs, is a tour de force in that a single author has written it all. But the other, by Cassidy, is not far behind, as there are only five collaborators, who are given little of the responsibility. Essentially, then, these two books reflect the opinions of the