In _multiple personality_ amnesia for large epochs in the subject’s life is quite generally a prominent feature. In one phase of personality there is no knowledge whatsoever of existence in another phase. Thus, for instance, all the experiences of BI and BIV, in the case of Miss B., were respectively unknown to the other. When, however, the change took place from one personality to the other, with accompanying amnesia, all the great mass of experiences of the one personality still remained organized and conserved during the cycle of the other’s existence. With the reversion to the first personality, whichever it might be, the previously formed experiences of that personality became capable of manifesting themselves as conscious memories. This conservation could also be shown, in this case, by the method of tapping the conserved memories and producing crystal visions or artificial hallucinations. Those who are familiar with the published account of the case will remember that BIV was in the habit at one time of acquiring knowledge of the amnesic periods of BI’s existence by “fixing” her mind and obtaining a visual picture of the latter’s acts. Likewise, it will be remembered that by crystal visions I was enabled to bring into consciousness a vision of the scene at the hospital which, through its emotional influence, caused the catastrophe of dissociation of personality, and also of the scene enacted by BI just preceding the awakening of BIV, of all of which BIV had no knowledge.[41] As with Mr. Hanna sometimes these memories instead of being complex pictures were scrappy—mere flashes in the pan. The same condition of conservation of the experiences of one personality during the existence of another obtained in the case of B. C. A. and numerous cases recorded in the literature. In this respect the condition is the same as that which obtains in hypnotic states and which I mentioned a few moments ago. We may, in fact, lay it down as a general law that during any dissociated state, no matter how extensive or how intense the amnesia, all the experiences that can be recalled in any other state, whether the normal one or another dissociated state, are conserved and, theoretically at least, can be made to manifest themselves. And, likewise and to the same extent, during the normal state the experiences which belong to a dissociated state are still conserved, notwithstanding the existing amnesia for those experiences. Furthermore, if we were dealing with special pathology we would be able to show that many pathological phenomena are due to the subconscious manifestations of such conserved and forgotten experiences.