In the revision of this important little book Dr Apley has added new data derived from further follow-up observations and from studies of pupillary reflexes among selected patients. However, as he indicates in the preface, the major purpose of the new edition has been more to restate his basic concepts than to add a few factual items. The monograph remains largely identical to the first edition. While this might at first glance appear to represent a detraction, I am delighted that the revision remains true to the good sense and good humor that pervaded the original edition. Publication at this time should reintroduce the subject to a new generation of young people who read only "the most up-to-date stuff."
The monograph primarily deals with data accumulated from a series of 1,000 unselected school children among whom 108 suffered from abdominal pain. These pains varied in frequency; their duration ranged from