The nature of this ambivalent relation so often emphasized as fundamental, namely, that the positive underlying desire is unconscious, opens the possibility of showing further connections and explaining further problems. The pyschic processes in the unconscious are not entirely identical with those known to us from our conscious psychic life, but have the benefit of certain notable liberties of which the latter are deprived. An unconscious impulse need not have originated where we find it expressed, it can spring from an entirely different place and may originally have referred to other persons and relations, but through the mechanism of _displacement_, it reaches the point where it comes to our notice. Thanks to the indestructibility of unconscious processes and their inaccessibility to correction, the impulse may be saved over from earlier times to which it was adapted to later periods and conditions in which its manifestations must necessarily seem foreign. These are all only hints, but a careful elaboration of them would show how important they may become for the understanding of the development of civilization. In closing these discussions we do not want to neglect to make an observation that will be of use for later investigations. Even if we insist upon the essential similarity between taboo and moral prohibitions we do not dispute that a psychological difference must exist between them. A change in the relations of the fundamental ambivalence can be the only reason why the prohibition no longer appears in the form of a taboo. In the analytical consideration of taboo phenomena we have hitherto allowed ourselves to be guided by their demonstrable agreements with compulsion neurosis; but as taboo is not a neurosis but a social creation we are also confronted with the task of showing wherein lies the essential difference between the neurosis and a product of culture like the taboo.