This principle, it seems to me, is of far-reaching application. The persistence of the feeling tone in a pleasant or unpleasant mental attitude after the experience giving rise to it has become dormant is _observed in everyday life_ and can be explained on this principle. We have an exalting experience, engage in a spirited game of tennis, watch an exciting football match, or take part in an exhilarating dance. For the remainder of the day or the next day we still experience all the stimulating pleasurable feeling, even though in the cares of our vocation the memories of the previous experiences have remained dormant, not having once been called to mind. The only difference between such experiences of everyday life and those of hypnosis is that in one case we can, if we will, recall the origin of the feeling and in the other we cannot. In both we do not.[182] Dormant _dream_ complexes may give rise to similar phenomena. In a minor way everyone, probably, has experienced the persistence of the emotional effects of a dream after waking and after the memory of the dream has vanished. More commonly, of course, the dream is remembered, but in the cases of people who do not remember their dreams the phenomenon is precise. B. C. A., for example, does not as a rule remember her dreams, but nevertheless frequently awakes in a state of anxiety or exaltation which has considerable persistency. In hypnosis the dream which gives rise to the emotional state is recovered. In pathological conditions these post-hypnotic, hysterical, dream, and other phenomena suggest, among other questions, whether in depressive and excited psychoses the affective element is not derived from submerged unconscious complexes. _Melancholias_, for example, may in some cases at least derive their feeling tone from such complexes. ----- Footnote 171: Janet: The Mental States of Hystericals, pp. 289-290. Prince: The Dissociation, pp. 132-5, 262, 297–8, 324-5, 497. Footnote 172: The Unconscious, _Journal Abnormal Psychology_, April-May, 1909. Footnote 173: Morton Prince: (Psychotherapeutics; A Symposium. Richard G. Badger, Boston, 1910.) Also The Unconscious, _Journal of Abnormal Psychology_, April-May, and June-July, 1909. Footnote 174: See p. 178, Lecture VI. Footnote 175: Memory of them could only be obtained in abstraction and hypnosis. Footnote 176: Fear Neurosis, _Boston Med. and Surg. Journal_, September 28, 1898. Footnote 177: The Dissociation, see index, “Subconscious Ideas,” and “Subconscious Self.” Footnote 178: The Dissociation, loc. cit. Footnote 179: Ibid., p. 132. Footnote 180: It is worth noting that this interpretation is supported by the therapeutic result. The attacks completely and quickly ceased after the setting to her apprehensive idea was so altered, by one single explanation, that she no longer feared the loyalty of her friend. Footnote 181: