We now come to spontaneous cases of multiple personality, of which Louis Vivé's is one of the best known. Louis Vivé exhibited an extraordinary number and variety of phases of personality, affording an extreme example of dissociations dependent on _time-relations_, on the special epoch of life in which the subject was ordered to find himself.[21] Among various conditions of his organism--all but one of them implying, or at least simulating, some grave central lesion--any given condition could be revived in a moment, and the whole gamut of changes rung on his nervous system as easily as if one were setting back or forward a continuous cinematograph. It is hard to frame a theory of memory which shall admit of these sudden reversions,--of playing fast and loose in this manner with the accumulated impressions of years. Yet if Louis Vivé's case thus strangely intensifies the already puzzling notion of _ecmnesia_--as though the whole organism could be tricked into forgetting the events which had most deeply stamped it--what are we to say to Dr. Morton Prince's case of "Sally Beauchamp,"[22] with its grotesque exaggeration of a subliminal self--a kind of hostile bedfellow which knows everything and remembers everything--which mocks the emotions and thwarts the projects of the ordinary reasonable self which can be seen and known? The case must be studied in full as it stands; its later developments may help to unravel the mysteries which its earlier stages have already woven.[23] I quote in full in the text the next case, reported by Dr. R. Osgood Mason (in a paper entitled "Duplex Personality: its Relation to Hypnotism and to Lucidity," in the _Journal of the American Medical Association_, November 30th, 1895). Dr. Mason writes:--