Page:Philosophical Review Volume 3.djvu/561

545 unstable conception. But the return from Dualism, the overcoming of this division, belongs to philosophy, and not to this paper. Many have observed, with Sir William Hamilton, that a representative theory of knowledge must be unsatisfactory. Many, however, have supposed, as he did, and as, in another way, Avenarius supposes, that what Avenarius has called "Die Ausschaltung der Introjektion," the overcoming of dualism, the abandonment of the representative theory of knowledge, must involve a realistic representation of the world of human experience. I am not of this mind. But for the present I am content to leave in your hands, not any refutation of dualism, nor indeed any theory of knowledge as such, but this general sketch of the psychological origin of our concept of the categories of what we are accustomed to call external reality.