PREFACE Most of the articles in this book that have previously appeared in print received helpful criticism from my dear friend Mrs. Ella Adams Moore, who now rests from her many forms of kindly service. My pupil and friend Mr. Edward C. Wagenknecht has criticized nearly all of the papers that are here printed for the first time. This exchange of rôles between pupil and teacher has been most pleasant and profitable. The study that closes the volume has been greatly helped by some suggestions of Professor John M. Manly, but he has not seen the article in its present form. The University of Chicago, |