In studying social phenomena and social problems it is the business of the psychologist, as it is not the business of the social reformer, or even, it would seem, of the sociologist, to register his results regardless of any personal political predilections. The data of the psycho-analyst furnish part, or should furnish part, of the material upon which statesmen base their activities. The psycho-analyst always understands that he is only supplying some portion and not the whole of the material for action, the importance of the material varying a great deal with the nature of the question under investigation. Those who wish to disregard the sociological implications of psycho-analysis usually ignore the limitations that the