strive in vain to invent out of ourselves even a single perceptual element which has never appeared within the sphere of what has been given to us. It is one thing to be merely acquainted with the world; it is another to have knowledge of its essential nature. This nature, for all that it is closely identified with the world-content, does not become clear to us unless we build up reality ourselves out of the Given and the Forms of Thought. The real "what" of the Given comes to be affirmed for the Ego only through the Ego itself. The Ego would have no occasion to affirm the nature of the Given for itself, if it did not find itself confronted at the outset by the Given in wholly indeterminate form. Thus, the essential nature of the world is affirmed, not apart from, but through, the Ego. The true form of reality is not the first form in which it presents itself to the Ego, but the last form which it receives through the activity of the Ego. That first form is, in fact, without any importance for the objective world and counts only as the basis for the process of cognition. Hence, it is not the form given to the world by theory which is subjective, but rather the form in which the world is originally given to the Ego. If, following Volkelt and others, we call the given world "experience," our view amounts to saying: The world-picture presents itself, owing to the constitution of our consciousness, in subjective form as experience, but science completes it and makes its true nature manifest. Our Theory of Knowledge supplies the basis for an Idealism which, in the true sense of the word, understands itself. It supplies good grounds for the conviction that thinking brings home to us the essential nature of the world. Nothing but thinking can exhibit the relations of the parts of the world-content, be it the relation of the heat of the sun to the stone which it warms, or the relation of the Ego to the external world. Thinking alone has the function of determining all things in their relations to each other. The objection might still be urged by the followers of Kant, that the determination, above-described, of the Given holds, after all, only for the Ego. Our reply must be, consistently with our principles, that the distinction between Ego and Outer World, too, holds only within the Given, and that, therefore, it is irrelevant to insist on the phrase, "for the Ego," in the face of the activity of thinking which unites all opposites. The Ego, as divorced from the outer world, disappears completely in the process of thinking out the nature of the world. Hence it becomes meaningless still to talk of determinations which hold only for the Ego. VII CONCLUDING REMARKS: EPISTEMOLOGICAL