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The author states that the book is essentially an account of his studies and interpretations of various modes of human and animal behavior; and there is a foreword written by Robert M. Yerkes hailing this book as "the first chapter of a new and promising psychopathology." The introduction, written for "both medical and non-medical readers" (the reviewer would say rather the latter than the former) describes some of the fundamental biologic data as applied to medical and psychologic investigation, together with a statement of a method of research to determine "how the human organism tends to respond to the great variety of stimulations which call for adjustments of the body as a whole to the outside world" by a program aiming: "(1) to isolate a few of the more important types of situations to which the nervous patient is apt to respond abnormally; (2) to subject various mammalian species to