Mental experiences formed in states of _alcoholic intoxication_ without delirium may be conserved as dormant complexes. Dr. Isador Coriat,[43] in his studies of _alcoholic amnesia_, was able to restore memories of experiences occurring during the alcoholic state showing that they were still conserved. The person, during the period for which later there is amnesia, may or may not be what is ordinarily called drunk, although under the influence of alcohol. Later, when he comes to himself, he is found to have forgotten the whole alcoholic period—perhaps several days or a week—during which he may have acted with apparently ordinary intelligence, and perhaps have committed criminal acts. By one or another of several technical methods memory of the forgotten period may often be recalled. Dr. C. W. Pilgrim[44] also has reported two cases of this kind in which he succeeded in restoring the memories of the forgotten alcoholic state. I might also recall here the case, cited by Ribot, of the Irish porter who, having lost a package while drunk, got drunk again and remembered where he had left it. Of course, in order to demonstrate the conservation of forgotten experiences it is necessary, when abstraction is not sufficient, to employ subjects in whom more profound dissociation of consciousness can be produced by one or another of the artificial means described so as to permit of the reproduction of the hidden (conserved) experiences of mental life. Such subjects, however, are sufficiently common. Often the passive state of abstraction after some practice is sufficient. Summary Although in the above résumé of the phenomena of memory I have for the most part made use of personal observations, these, so far as the phenomena themselves are concerned, are in accord with those of other observers. It would have been easy to have drawn for corroboration upon the writings of Gurney, Janet, Charcot, Breuer, Freud, Sidis, Coriat, and others. A survey of all the facts which I have outlined in this lecture forces us to ask ourselves the question: To what extent are life’s experiences conserved? Indeed it was to meet this question that I have reviewed so large a variety of forgotten experiences which experiment or observation in individual cases has shown to be conserved. If my aim had been to show simply that an experience, which has been lost beyond all possible voluntary recall, may still be within the power of reproduction when special devices adapted to the purpose are employed, it would not have been necessary to cover such a wide field of inquiry. To meet the wider question it was necessary to go farther afield and examine a large variety of experiences occurring in multiform conditions of mental life.