The switching process is an interesting problem in itself. (Cf. Max Levy-Suhl: Ueber Einstellungsvorgänge in normalen und anormalen Seelenzuständen. Zeitschrift für Psychotherapie und Medizinishe Psychologie, Bd. 11, Hft. 3, 1910.) An example is the well-known psychological diagram which may be perceived at one moment as a flight of steps and at another as an overhanging wall, according as which perception of the same line is switched in. Footnote 147: Lectures not included in this volume. Footnote 148: In the case of Miss B., for example, Sally had absolute amnesia for certain systems of subject-complexes (Latin, French, etc.) possessed by the other personalities. Footnote 149: William Sharp, A Memoir, by Elizabeth A. Sharp. Footnote 150: My Life as a Dissociated Personality, _Journal of Abnormal Psychology_, October-November, 1908, December-January, 1909. Footnote 151: The Dissociation, Chapter XXIII. Footnote 152: Provided, of course, this new knowledge is justified and not contradicted by the facts and principles of life. In other words, it must be believed, at least, to be the truth. Footnote 153: While these pages were in press, Lord Haldane in his Montreal address (before the American Bar Association), which has attracted wide attention, developed the psychological principle of “Sittlichkeit,” as applied to communities, the nation and groups of nations. By “Sittlichkeit” is meant the social habit of mind and action underlying social customs, the instinctive sense of social obligation which is the foundation of society. This plainly includes what is often called the social conscience and actions impelled thereby. In further definition of this principle Lord Haldane quotes Fichte as stating “Sittlichkeit” to mean “those principles of conduct which regulate people in their relations to each other, and have become matter of habit and second nature at the stage of culture reached, and of which, therefore, we are not explicitly conscious.” The point was made that the citizen is governed “only to a small extent by law and legality on the one hand, and by the dictates of the individual conscience on the other.” It is the more extensive system of “Sittlichkeit” which plays the predominant rôle. Out of this system there develops a unity of thought and “a common ideal” which can be made to penetrate the soul of a people and to take complete possession of it. Likewise there develops “a general will with which the will of the good citizen is in accord.” This will of the community (inspired by the common ideal) is common to the individuals composing it. Lord Haldane goes on to make the point that what is now true within a single nation may in time come to be true between nations or a group of nations. Thus an international habit of looking to common ideals may grow up sufficiently strong to develop a general will, and to make the binding