We cannot go any further at this point; for I think it likely that a disturbing thought has long since occurred to you and it deserves a hearing. You may ask: “Is the so-called ‘residue’ really unconscious in the sense in which the wish necessary for the formation of the dream is unconscious?” Your suspicion is justified: this is the salient point in the whole matter. They are not both unconscious in the same sense. The dream-wish belongs to a different type of UNCONSCIOUS, which, as we have seen, has its roots in the infantile period and is furnished with special mechanisms. It is very expedient to distinguish the two types of “unconscious” from one another by speaking of them in different terms. But, all the same, we will rather wait until we have familiarized ourselves with the phenomena of the neuroses. If our conception of the existence of any kind of unconscious be already regarded as fantastic, what will people say if we admit that to reach our solution we have had to assume two kinds? Let us break off at this point. Once more you have heard only an incomplete statement; but is it not a hopeful thought that this knowledge will be carried further, either by ourselves or by those who come after us? And have not we ourselves learnt enough that is new and startling? FIFTEENTH LECTURE DOUBTFUL POINTS AND CRITICAL OBSERVATIONS We will not leave the subject of dreams without dealing with the most common doubts and uncertainties arising in connection with the novel ideas and conceptions we have been discussing: those of you who have followed these lectures attentively will have collected some material of the kind.