I will return to this primal splitting of the libido in another place. Here let us concern ourselves only with the problem of the transition of the libido. The transition takes place, as has been repeatedly suggested by means of shifting to an analogy. The libido is taken away from its proper place and transferred to another substratum. The resistance against sexuality aims, therefore, at preventing the sexual act; it also seeks to crowd the libido away from the sexual function. We see, for example, in hysteria, how the specific repression blocks the real path of transference; therefore, the libido is obliged to take another path, and that an earlier one, namely, the incestuous road which ultimately leads to the parents. Let us speak, however, of the incest prohibition, which hindered the very first sexual transference. Then the situation changes in so far that no earlier way of transference is left, except that of the presexual stage of development, where the libido was still partly in the function of nutrition. By a regression to the presexual material the libido becomes quasi-desexualized. But as the incest prohibition signifies only a temporary and conditional restriction of the sexuality, thus only that part of the libido which is best designated as the incestuous component is now pushed back to the presexual stage. The repression, therefore, concerns only that part of the sexual libido which wishes to fix itself permanently upon the parents. The sexual libido is only withdrawn from the incestuous component, repressed upon the presexual stage, and there, if the operation is successful, desexualized, by which this amount of libido is prepared for an asexual application. However, it is to be assumed that this operation is accomplished only with difficulty, because the incestuous libido, so to speak, must be artificially separated from the sexual libido, with which, for ages, through the whole animal kingdom, it was indistinguishably united. The regression of the incestuous component must, therefore, take place, not only with great difficulty, but also carry with it into the presexual stage a considerable sexual character. The consequence of this is that the resulting phenomena, although stamped with the character of the sexual act, are, nevertheless, not really sexual acts _de facto_; they are derived from the presexual stage, and are maintained by the repressed sexual libido, therefore possess a double significance. Thus the fire boring is a coitus (and, to be sure, an incestuous one), but a desexualized one, which has lost its immediate sexual worth, and is, therefore, indirectly useful to the propagation of the species. The presexual stage is characterized by countless possibilities of application, because the libido has not yet formed definite localizations. It therefore appears intelligible that an amount of libido which reaches this stage through regression is confronted with manifold possibilities of application.