complexions stand opposite each other in preparation for a fight, fall upon each other, seize each other, take up the old position again, and repeat the whole performance;" here the interpretation of these rows of boys as teeth is plausible in itself, and it seems to become convincing when after this scene the dreamer "pulls a long tooth out of his jaws." The interpretation of "long, narrow, winding corridors" as intestinal stimuli, seems sound and confirms Schirmer's assertion that the dream above all seeks to represent the stimulus-producing organ by means of objects resembling it. Thus we must be prepared to admit that the internal stimuli may play the same role in the dream as the external. Unfortunately, their evaluation is subject to the same difficulties as those we have already encountered. In a large number of cases the interpretation of the stimuli as somatic remains uncertain and undemonstrable. Not all dreams, but only a certain portion of them, arouse the suspicion that an internal organic stimulus was concerned in their causation. And finally, the internal stimuli will be as little able as the external sensory stimuli to explain any more of the dream than pertains to the direct reaction to the stimuli. The origin, therefore, of the rest of the dream remains obscure. Let us, however, notice a peculiarity of dream life which becomes apparent in the study of these effects of stimuli. The dream does not simply reproduce the stimulus, but it elaborates it, it plays upon it, places it in a sequence of relationships, replaces it with something else. That is a side of dream activity which must interest us because it may lead us closer to the nature of the dream. If one does something under stimulation, then this stimulation need not exhaust the act. Shakespeare's _Macbeth_, for example, is a drama created on the occasion of the coronation of the King who for the first time wore upon his head the crown symbolizing the union of three countries. But does this historical occasion cover the content of the drama, does it explain its greatness and its riddle? Perhaps the external and internal stimuli, acting upon the sleeper, are only the incitors of the dream, of whose nature nothing is betrayed to us from our knowledge of that fact. The other element common to dreams, their psychic peculiarity, is on the one hand hard to comprehend, and on the other hand offers no point for further investigation. In dreams we perceive a thing for the most part in visual forms. Can the stimuli furnish a solution for this fact? Is it actually the stimulus which we experience? Why, then, is the experience visual when optic stimulation incited the dream only in the rarest cases? Or can it be proved, when we dream speeches, that during sleep a conversation or sounds resembling it reached our ear? This possibility I venture decisively to reject.