The chief aim of the present volume is to provide the general reader with a brief, yet it is hoped sufficiently comprehensive, ac count of the principles underlying scientific psychotherapy; and to afford some idea Of the methods by which it is applied in the treatment Of disease, and also of the mala dies to which it is applicable. For this rea son the use of technical terms has been. Avoided as far as possible, and there has been a liberal citation of illustrative cases for the purpose Of bringing the principles and the methods concretely to the reader's mind, and in order to emphasize the fundamental differences between psychotherapy of the scientific type and the psychotherapy of faith healing.