are too weak, while the stronger images in their neighbourhood are remembered. However, the factor of intensity is in itself not the only determinant of the preservation of dream-images; Strumpell, as well as other authors (Calkins), admits that dream-images are often rapidly forgotten although they are known to have been vivid, whereas, among those that are retained in the memory, there are many that are very shadowy and unmeaning. Besides, in the waking state one is wont to forget rather easily things that have happened only once, and to remember more readily things which occur repeatedly. But most dream-images are unique experiences, * and this peculiarity would contribute towards the forgetting of all dreams equally. Of much greater significance is a third cause of forgetting. In order that feelings, representations, ideas and the like should attain a certain degree of memorability, it is important that they should not remain isolated, but that they should enter into connections and associations of an appropriate nature. If the words of a verse of poetry are taken and mixed together, it will be very difficult to remember them. "Properly placed, in a significant sequence, one word helps another, and the whole, making sense, remains and is easily and lastingly fixed in the memory. Contradictions, as a rule, are retained with just as much difficulty and just as rarely as things that are confused and disorderly." Now dreams, in most cases, lack sense and order. Dream-compositions, by their very nature, are insusceptible of being remembered, and they are forgotten because as a rule they fall to pieces the very next moment. To be sure, these conclusions are not entirely consistent with Radestock's observation (p. 168), that we most readily retain just those dreams which are most peculiar.

* Periodically recurrent dreams have been observed repeatedly. Compare the collection made by Chabaneix.

According to Strumpell, other factors, deriving from the relation of the dream to the waking state, are even more effective in causing us to forget our dreams. The forgetfulness of dreams manifested by the waking consciousness is evidently merely the counterpart of the fact already mentioned, namely, that the dream hardly ever takes over an orderly series of memories from the waking state, but only certain details of these memories, which it removes from the habitual psychic connections in which they are remembered in the waking state. The dream-composition, therefore, has no place in the community of the psychic series which fill the mind. It lacks all mnemonic aids. "In this manner the dream-structure rises, as it were, from the soil of our psychic life, and floats in psychic space like a cloud in the sky, quickly dispelled by the first breath of reawakening life" (p. 87). This situation is accentuated by the fact that on waking the attention is immediately besieged by the inrushing world of sensation, so that very few dream-images are capable of withstanding its force. They fade away before the impressions of the new day like the stars before the light of the sun.

Finally, we should remember that the fact that most people take but little interest in their dreams is conducive to the forgetting of dreams. Anyone who for some time applies himself to the investigation of dreams, and takes a special interest in them, usually dreams more during that period than at any other; he remembers his dreams more easily and more frequently.

Two other reasons for the forgetting of dreams, which Bonatelli (cited by Benini) adds to those adduced by Strumpell, have already been included in those enumerated above; namely, (1) that the difference of the general sensation in the sleeping and the waking state is unfavourable to mutual reproduction, and (2) that the different arrangement of the material in the dream makes the dream untranslatable, so to speak, for the waking consciousness.

It is therefore all the more remarkable, as Strumpell himself observes, that, in spite of all these reasons for forgetting the dream, so many dreams are retained in the memory. The continual efforts of those who have written on the subject to formulate laws for the remembering of dreams amount to an admission that here, too, there is something puzzling and unexplained. Certain peculiarities relating to the remembering of dreams have attracted particular attention of late; for example, the fact that the dream which is believed to be forgotten in the morning may be recalled in the course of the day on the occasion of some perception which accidentally touches the forgotten content of the dream (Radestock, Tissie). But the whole recollection of dreams is open to an objection which is calculated greatly to depreciate its value in critical eyes. One may doubt whether our memory, which omits so much from the dream, does not falsify what it retains.