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In the earlier phases of his psychoanalytical thought Freud was chiefly concerned with the nature and the fate of impulse—a fact to which the formulation of his famous libido theory bears eloquent witness. Thus it came about that modern psychopathology was founded essentially upon a psychology of impulse; and Freud's libido theory has remained one of the corner-stones in the edifice of psychoanalytical thought, albeit this theory is now generally accepted only with such modifications as were introduced by Abraham in deference to developmental considerations. It was always foreign to Freud's intention, however, to convey the impression that all the problems of psychopathology could be solved in terms of the psychology of impulse; and in the later phases of his thought—from a time which may be conveniently dated by the publication of The Ego and the Id—his attention was predominantly directed to the growth and the vicissitudes of the ego. Thus a developing psychology of the ego came to be superimposed upon an already established psychology of impulse; and, whatever developments the psychology of the ego may have subsequently undergone in psychoanalytical thought, the underlying libido theory has remained relatively unquestioned. This is a situation which I have lately come to regard as most regrettable. Unfortunately, the present occasion does not permit of an examination of the grounds upon which I have reached this opinion; and it must suffice to say that I have been influenced by clinical and psychotherapeutic,