This volume is now in its seventh edition because, as Dr. Joslin says in the preface, "there is always something new going on in diabetes." Moreover, the number of the diabetic is increasing because people are living longer. Therefore, education for this class becomes a more important problem. This volume is fully established as a most useful book in its field. It is up to date, well printed, excellently illustrated and written with inspiration. No intelligent person with diabetes should be without it.