These papers deal with the cause, diagnosis, and treatment of leukemia. For the most part the presentation is by well-known authorities. Highlights of the book are the informal discussions following each paper which often clarify obscure points, but even more often point out glaring gaps in our knowledge of fundamental aspects of the disease, its biologic behavior, and unpredictable responsiveness. A beautiful summary paper is presented by the editor. There is an excellent bibliography. The book is well indexed both as to subject matter and as to authors. The typography is beautiful. Unfortunately this book will be of prime interest only to workers in a limited field, but members of most disciplines in medicine could profit by reading it.