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Rh play a role which can hardly be overestimated as the motive power of later neuroses.

The interpretation of incest dread as an innate instinct must therefore be abandoned. The same holds true of another derivation of the incest prohibition which counts many supporters, namely, the assumption that primitive races very soon observed the dangers with which inbreeding threatened their race and that they therefore had decreed the incest prohibition with a conscious purpose. The objections to this attempted explanation crowd upon each other. Not only must the prohibition of incest be older than all breeding of domestic animals from which men could derive experience of the effect of inbreeding upon the characteristics of the breed, but the harmful consequences of inbreeding are not established beyond all doubt even to-day and in man they can be shown only with difficulty. Besides, everything that we know about contemporaneous savages makes it very improbable that the thoughts of their far-removed ancestors should already have been occupied with preventing injury to their later descendants. It sounds almost ridiculous to attribute hygienic and eugenic motives such as have hardly yet found consideration in our culture, to these