- rier" of Freud. The incest prohibition places an end to
the childish longing for the food-giving mother, and compels the libido, gradually becoming sexual, into the path of the biological aim. The libido forced away from the mother by the incest prohibition seeks for the sexual object in the place of the forbidden mother. In this wider psychologic sense, which expresses itself in the allegoric language of the "incest prohibition," "mother," etc., must be understood Freud's paradoxical sentence, "Originally we have known only sexual objects."[21] This sentence must be understood psychologically throughout, in the sense of a world image created from within outwards, which has, in the first place, nothing to do with the so-called "objective" idea of the world. This is to be understood as a new edition of the subjective idea of the world corrected by reality. Biology, as a science of objective experience, would have to reject unconditionally Freud's proposition, for, as we have made clear above, the function of reality can only be partly sexual; in another equally important part it is self-preservation. The matter appears different for that thought which accompanies the biological function as an epiphenomenon. As far as our knowledge reaches, the individual act of thought is dependent wholly or in greatest part on the existence of a highly differentiated brain, whereas the function of reality (adaptation to reality) is something which occurs in all living nature as wholly independent from the act of thought. This important proposition of Freud's applies only to the act of thought, for thinking, as we may recognize from manifold traces, arose dynami-
