This book is an encyclopedia of present-day psychology in all its branches, including those of medical psychology. 'Personality' is conceived as a not sharply delimited field, and almost everything that bears on it is considered proper content for this book. 'Straight' brain anatomy and much of brain physiology is omitted; nor is there any attempt to put the subject in a historical perspective. The authors of the separate chapters have been selected because of unquestioned competence in their special subject. Professors MacKinnon, Guthrie, Mowrer and Kluckhohn set forth general theoretical approaches to personality. The tests and 'cross-section' methods used by experimentalists and personnel psychologists are discussed by Edward S. Jones, J. R. Maller and Robert W. White, while the dynamics of behavior, experimental behavior disorders, and hypnotism are discussed by Thomas M. French, Leon J. Saul, Robert R. Sears, Kurt Lewin and his collaborators, Saul Rosenzweig, H. S. Liddell, Frank W. Finger, Neal E. Miller and Arthur Jennings. Heredity, constitution, brain lesions, and physiological