Finally, it should be said that much of what is not ordinarily regarded as memory is made up of conserved experiences. A large part of every mental content is memory the source of which is forgotten. Just as our vocabulary is memory, though we do not remember how and where it was acquired, so our judgments, beliefs, and opinions are in large part made up of past experiences which are forgotten but which have left their traces as integral parts of concepts ingrained in our personalities. ----- Footnote 27: For a full account of this experiment, see An Experimental Study of Visions, _Brain_, Winter Number, 1898; The Dissociation, pp. 81, 82. Footnote 28: The Dissociation, p. 77. Footnote 29: For numerous observations of this kind, see Pierre Janet: The Mental States of Hystericals. Footnote 30: The Mechanism and Interpretation of Dreams, loc. cit. Footnote 31: Loc. cit. See p. 51. Footnote 32: See Lecture VI, p. 185. Footnote 33: Gurney was among the first to demonstrate the induction of several states in the same subject. He was able to obtain three different hypnotic states (Proceedings S. P. R., Vol. IV, p. 515), and Mrs. Sidgwick and Miss Johnson eight in one individual, each with amnesia for the other. Janet, of course, demonstrated the same phenomena. In the cases of Miss B. and B. C. A. I obtained a large number of such states. Footnote 34: Morton Prince: The Dissociation, p. 55; also An Experimental Study of Visions, _Brain_, Winter Number, 1898. Footnote 35: Some of the Revelations of Hypnotism, _Boston Medical and Surgical Journal_, May 22, 1890. Footnote 36: Studien über Hysterie. Footnote 37: Of course I am not discussing here the genetic mechanism of the amnesia, being concerned only with the principle of conservation. Footnote 38: The Dissociation, pp. 284-5, 456-9. Footnote 39: Boris Sidis: The Psychology of Suggestion, p. 224; see also Multiple Personality, p. 143. Footnote 40: _The Journal of Abnormal Psychology_, Vol. II, p. 93. Footnote 41: The Dissociation, pp. 220, 221, 255, 531, 532. Footnote 42: The Dissociation, p. 83. Footnote 43: _The Journal of Abnormal Psychology_, Vol. I, No. 3. Footnote 44: _American Journal of Insanity_, July, 1910. LECTURE IV CONSERVATION A RESIDUUM OF EXPERIENCES A consideration of all the facts of observation and experiment of the kind which I have recited in the last two lectures—and I might have multiplied them many times—forces us to the conclusion that whether or not we can recall any given experience it may be still conserved. Bear in mind that I have used conservation, thus far, only in the sense that under favoring changes in the moment’s consciousness, or by special methods of stimulation, a past experience may reproduce itself, or may be made to reproduce itself, in one form or another of memory.