mind through autoerotism[33] is so familiar a fact that examples of that are superfluous.) The course of the libido, as we may conclude from these studies, originally proceeded in a similar manner as in the child, only in a reversed sequence. The sexual act was pushed out of its proper zone and was transferred into the analogous mouth zone[34]—the mouth receiving the significance of the female genitals; the hand and the fingers, respectively, receiving the phallic meaning.[35] In this manner the regressively reoccupied activity of the presexual stage is invested with the sexual significance, which, indeed, it already possessed, in part, before, but in a wholly different sense. Certain functions of the presexual stage are found to be permanently suitable, and, therefore, are retained later on as sexual functions. Thus, for example, the mouth zone is retained as of erotic importance, meaning that its valuation is permanently fixed. Concerning the mouth, we know that it also has a sexual meaning among animals, inasmuch as, for example, stallions bite mares in the sexual act; also, cats, cocks, etc. A second significance of the mouth is as an instrument of speech, it serves essentially in the production of the mating call, which mostly represents the developed tones of the animal kingdom. As to the hand, we know that it has the important significance of the contrectation organ (for example, among frogs). The frequent erotic use of the hand among monkeys is well known. If there exists a resistance against the real sexuality, then the accumulated libido is most likely to cause a hyperfunction of those collaterals which are most adapted to compensate for the resistance, that is to say,
