Above all, it is met with the possibility of a purely onanistic activity. But as the matter in question in the regressive component of libido is sexual libido, the ultimate object of which is propagation, therefore it goes to the external object (Parents); it will also introvert with this destination as its essential character. The result, therefore, is that the purely onanistic activity turns out to be insufficient, and another object must be sought for, which takes the place of the incest object. The nurturing mother earth represents the ideal example of such an object. The psychology of the presexual stage contributes the nutrition component; the sexual libido the coitus idea. From this the ancient symbols of agriculture arise. In the work of agriculture hunger and incest intermingle. The ancient cults of mother earth and all the superstitions founded thereon saw in the cultivation of the earth the fertilization of the mother. The aim of the action is desexualized, however, for it is the fruit of the field and the nourishment contained therein. The regression resulting from the incest prohibition leads, in this case, to the new valuation of the mother; this time, however, not as a sexual object, but as a nourisher. The discovery of fire seems to be due to a very similar regression to the presexual stage, more particularly to the nearest stage of the displaced rhythmic manifestation. The libido, introverted from the incest prohibition (with the more detailed designation of the motor components of coitus), when it reaches the presexual stage, meets the related infantile boring, to which it now gives, in accordance with its realistic destination, an actual material. (Therefore the material is fittingly called “materia,” as the object is the mother as above.) As I sought to show above, the action of the infantile boring requires only the strength and perseverance of an adult man and suitable “material” in order to generate fire. If this is so, it may be expected that analogous to our foregoing case of onanistic boring the generation of fire originally occurred as such an act of quasi-onanistic activity, objectively expressed. The demonstration of this can never be actually furnished, but it is thinkable that somewhere traces of this original onanistic preliminary exercise of fire production have been preserved. I have succeeded in finding a passage in a very old monument of Hindoo literature which contains this transition of the sexual libido through the onanistic phase in the preparation of fire. This passage is found in Brihadâranyaka-Upanishad:[309]