fundamentally nothing more than a special form of our thinking, which is made possible by the conditions of the sleeping state. It is the dream-work which produces this form, and it alone is the essence of dreaming- the only explanation of its singularity. I say this in order to correct the reader's judgment of the notorious prospective tendency of dreams. That the dream should concern itself with efforts to perform the tasks with which our psychic life is confronted is no more remarkable than that our conscious waking life should so concern itself, and I will only add that this work may be done also in the preconscious, a fact already familiar to us.