Miss B. reverts on one occasion to a day, six years back, when she received a psychical shock; the complexes of her personality of that day are revived as if just lived, all the succeeding years being forgotten; on another occasion she reverts to a day when she was living in another city seven or eight years before. M——l reverts to an early period of his life when he was living in Russia, and forgets all since including even his knowledge of English. B. C. A. on several occasions reverts to different epochs of her life with complete amnesia for all after events. On each occasion she takes up the thread of her mental life as if living in the past, and recites the events as if just lived. Likewise, after a subject reverts from the abnormal to the normal state, after a short or long condition of altered personality, there may be a complete amnesia for the abnormal epoch, and although now normal he thinks it the same day on which dissociation occurred. Thus, Miss O. develops a condition of dissociated personality lasting six months during which, as it unfortunately happens, she falls in love with a man whom she had never known in her normal state. At the end of this period she “wakes up” with a complete loss of memory for the phase of altered personality and, therefore, to find that her fiancé is apparently a stranger to her (!). The same amnesia in the normal state for prolonged epochs in which the personality was altered was conspicuous in the case of Miss B. In William James’ often-cited case of Ansel Bourne and Dr. E. E. Mayer’s case of Chas. W. the subjects returned to their normal states with complete amnesia for the abnormal epochs of two months and seventeen years respectively. After all, the common _amnesia for the hypnotic state after waking is the same phenomenon_. Such observations show the possible systematization of epoch complexes, although the determining conditions are not as yet understood.