As such things happen, several manuscripts in the present volume were under review prior to the ones that appeared in Volume I of the Annals. A major difficulty encountered in the preparation of these volumes apart from working up to three years in advance of publication-is elic iting appropriate commentary. If this format is to succeed, the com mentary must be both engaging to the reader and satisfying to the author. It is not yet clear how successful we have been in this regard and, indeed, we do not feel bound to publish commentary with each manuscript that is accepted for publication....