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This work is designed to be an introduction to abnormal psychology. The problems considered, however, belong equally to normal psychology. The present volume consists of selected lectures (with the exception of four) from courses on abnormal psychology delivered at the Tufts College Medical School (1908-10) and later at the University of California (1910). These again were based on a series of papers on the Unconscious published in the Journal of Abnormal Psychology (1908-9) of which they are elaborations. Since the lectures were delivered a large amount of new material has been incorporated and the subject matter considered in more detail and more exhaustively than was practical before student bodies. The four additional lectures (X, XI, XII and XIII) appeared in abbreviated form in the same Journal (Oct., Nov., 1912) under the title "The Meaning of Ideas as Determined by Unconscious Settings." As the subconscious and its processes are fundamentals both in the structure of personality and in the many mechanisms through which personality, normal and abnormal, finds expression, the first eight lectures are devoted to its exposition. Indeed, the subconscious is not only the most important problem of psychology, it is the problem. The study of its phenomena must be preliminary to that of the functioning mechanisms of both the normal mind and of those special pathological conditions--the psycho-neuroses--which modern investigators are tracing to its perversions. It ought to be possible to construct the theory of the subconscious by inductive methods on the basis of facts of observation just as any theory of the physical sciences is constructed. This task I have set before myself as well as that of giving precision to our conception of the theory and taking it out of the domain of philosophical concepts. With this purpose in view I have endeavored to apply the method of science and construct the theory by induction from the data of observation and experiment. I have divided the subconscious into two classes, namely (1) the unconscious, or neural dispositions and processes, and (2) the coconscious, or actual subconscious ideas which do not enter the content of conscious awareness. In these lectures I have also endeavored (Lectures XIV-XVI) to develop the phenomena of the emotional innate dispositions which I conceive play one of the most fundamental parts in human personality and in determining mental and physiological behavior. Experimental methods and the well-known clinical methods of investigation have been employed by me as far as possible. The data made use of have been derived for the most part from my own observations, though confirmatory observations of others have not been neglected. Although a large number and variety of subjects or cases have been studied, as they have presented themselves in private and hospital practice, the data have been to a large extent sought in intensive studies, on particular subjects, carried on in some cases over a period of many years. These subjects, because of the ease with which subconscious and emotional phenomena were either spontaneously manifested or could be experimentally evoked, were particularly suitable for such studies and fruitful in results. It is by such intensive studies on special subjects, rather than by casual observation of many cases, that I believe the deepest insight into mental processes and mechanisms can be obtained. The favorable reception which was given to the first edition of this work has tempted me in preparing a new edition at the request of the publishers to incorporate four additional chapters dealing with the general principles underlying the structure and dynamic elements of human personality (Lecture XVII) and a study of a special problem in personality in which these principles are involved, namely, the psychogenesis of multiple personality as illustrated by a study of the case known as B.C.A. (Lectures XVIII-