The technique for the exploration of the unconscious origin is the one I mentioned before, used before Freud by every scientific man who attempted to arrive at a psychological understanding of dreams. We try simply to remember where the parts of the dream arose. The psychoanalytic technique for the interpretation of dreams is based on this very simple principle. It is a fact that certain parts of the dream originate in daily life, that is, in events which, on account of their slighter importance, would have fallen into oblivion, and indeed were on the way to become definitely unconscious. It is these parts of the dream that are the effect of unconscious images and representations. People have been shocked by this expression also. But we do not conceive these things so concretely, not to say crudely, as do the critics. Certainly this expression is nothing but a symbolism taken from conscious psychology—we were never in any doubt as to that. The expression is quite clear and answers very well as a symbol of an unknown psychic fact. As we mentioned before, we can conceive the unconscious only by analogy with the conscious. We do not imagine that we understand a thing when we have discovered a beautiful and rather incomprehensible name. The principle of the psychoanalytic technique is, as you see, extraordinarily simple. The further procedure follows on in the same way. If we occupy ourselves long with a dream, a thing which, apart from psychoanalysis, naturally never happens, we are apt to find still more reminiscences to the various different parts of the dream. We are not however always successful in finding reminiscences to certain portions. We have to put aside these dreams, or parts of dreams, whether we will or no. The collected reminiscences are called the “_dream material_.” We treat this material by a universally valid scientific method. If you ever have to work up experimental material, you compare the individual units and classify them according to similarities. You proceed exactly in the same way with dream-material; you look for the common traits either of a formal or a substantial nature. Certain extremely common prejudices must be got rid of. I have always noticed that the beginner is looking for one trait or another and tries to make his material conform to his expectation. This condition I noticed especially among those colleagues who were formerly more or less passionate opponents of psychoanalysis, their opposition being based on well-known prejudices and misunderstandings. When I had the chance of analyzing them, whereby they obtained at last a real insight into the method, the first mistake generally made in their own psychoanalytic work was that they did violence to the material by their own preconceived opinion. They gave vent to their former prejudice against psychoanalysis in their attitude towards the material, which they could not estimate objectively, but only according to their subjective phantasies.