Although the theory of the subconscious and that of the dynamics of specific conscious and subconscious processes (to the fundamental principles of both of which these lectures were limited) owe their value to our being able through them to explain many mental and physiological abnormalities, they possess an equal value from the light they throw upon the structure and dynamics of that composite whole best termed human personality. Over and above a knowledge of the abnormal, what we as human beings want to know is not only what sort of physiological beings but what sort of conscious beings we are; and how we think and act, and what motives and other impulses whether hidden or in the clear light of awareness, regulate and determine our behavior; what are the forces that do it and how. We want to know the answer to a lot of problems of this character, all of which involve principles of innate and acquired dispositions. A comprehensive study of human personality would include, as far as may be, answers to all these problems and would require a volume in itself. I have, therefore, not been able more than to give an outline in Lecture XVII of what seem to me to be the fundamental principles involved and the dynamic unitary systems out of which the structure is built up. There are various points of view from which the structure of the mind may be considered, just as with the structure of a literary work of art, or of a complicated mechanism like an automobile. We may consider the structure of the latter, for instance, as an assembly of complex units or mechanisms—cylinders, carburetors, ignition systems, etc.,—each analyzed into its elements, without regard to the dynamic, integrative functioning of the units in the total mechanism. This would be the static point of view. Or we may consider these units as wholes from the standpoint of the forces they generate, the processes they subserve and the parts they play in the total functioning of the whole machine. This is the dynamic point of view. It is this latter which alone has a vital practical interest. The former is of interest only to the technician. So with the mind. The dynamic point of view alone is of practical importance and alone awakens fascinating interest of stirring intensity. So long as psychology held to the static viewpoint it was only of academic value. For submitted to the pragmatic test it made little difference whether it was right or wrong. Nor could it become an applied science. Consequently it is from the dynamic viewpoint that I have sketched in—and it is little more than a sketch—the application of the principles laid down in these lectures to the peculiarly appealing problem of personality. Closely related to this is multiple personality, for it is a special problem in personality, and one that is a fascinating study in itself. But aside from its own intrinsic interest, its practical interest, its chief value is derived from the fact that it