This 1947 edition is dedicated especially to Dr. Isaac A. Abt, the senior author, on the occasion of his eightieth birthday. He has been Editor for 46 years. Notes have been prepared by Dr. Julius H. Hess, a pupil and associate of Dr. Abt, by Dr. A. Ashley Weech, and an unusual note by Dr. E. F. Ellis, who has the remarkable distinction of having received continuously every copy of the Year Book since Dr. Abt has been editor. His tribute to Dr. Abt can be applied in part to the Year Book. It indicates a record of usefulness through many years to physicians everywhere and in many professional segments outside of pediatrics. The publishers are to be congratulated as well as Dr. Abt. The present edition is up to the usual standards of quality, and it is obvious that its future is secure. It is an only book of its kind.