The author's own statement in the preface is the only indication of the changes which have been made in this edition. Since he states also that the book is not intended to be read conscientiously or for pleasure, but only when in need of information, it is implied that the information desired to use for judging a new edition is not necessarily a pleasure and one would surely not read conscientiously. The author's statement of the numerical changes can be only accepted. The book has been popular, it is unusual and it can be recommended for the use of medical students, interns, general practitioners and pediatricians, especially those engaged in teaching. Its easy use depends, "like one's golf," on constant practice.