In this book on the psychology of learning Professor Dunlap undertakes to set forth the interrelation of the learning and unlearning processes, which he feels has been neglected by educational psychology. Something over half of the text is concerned with the problems of habit and learning, the fundamental principles and a critical exposition of the various theories. The professor is quite willing to discard many of them, his own earlier theories along with the rest, and he is never tired of reminding us that we have a long way to go yet before we have a rounded-out and consistent body of knowledge concerning the many complex phases of the learning process. He believes, however, that we have gone