thought; the incongruence between its images and the feelings they engender; then the dream's evanescence, the way in which, on awakening, our thoughts thrust it aside as something bizarre, and our reminiscences mutilating or rejecting it — all these and many other problems have for many hundred years demanded answers which up till now could never have been satisfactory.

Before all there is the question as to the meaning of the dream, a question which is in itself double-sided. There is, firstly, the psychical significance of the dream, its position with regard to the psychical processes, as to a possible biological function; secondly, has the dream a meaning — can sense be made of each single dream as of other mental syntheses?

Three tendencies can be observed in the