The function of the brain and its product, the understanding, is likewise inseparable from the universal interdependence of things. The health of the blood which is produced by the action of the heart is no more and no less a material phenomenon than the total knowledge of science which appears as a product of brain life. Although we represent the doctrine of the material nature of understanding as the positive outcome of philosophy, this is not proclaiming the victory of that narrow materialism which has been spreading itself particularly since the eighteenth century. On the contrary, this mechanical materialism wholly misunderstands the nature of the problem. It teaches that the faculty of thought is a function of the brain, the brain is the object of study and its function, the faculty of thought, is fully explained as a brain quality or function. This materialism is enamored of mechanics, idolizes it, does not regard it as a part of the world, but as the sole substance which comprises the whole universe. Because it misunderstands the relation of thing and function, of subject and predicate, it has no inkling of the fact that this relation which it handles in such a matter-of-fact way, but not at all scientifically, may be an object worthy of study. The materialist of the old school is too horny-handed to consider the function or quality of understanding as an object worthy of a separate scientific department. We, on the other hand, follow the suggestion of Spinoza, who required of the philosophers that they should consider everything in the light of eternity. In so doing we find that the tangible things, such as the brain, are qualities of nature, and that in the same way the socalled functions are natural things, substantial parts of the universe. Not only tangible objects are "things," but also the rays of the sun and the scent of flowers belong to this category, and perceptions are no exception to the rule. But all these "things" are only relative things, since they are qualities of the one and absolute which is the only thing, the "thing itself," well known to every one by the name of the universe, or cosmos. IX THE FOUR PRINCIPLES OF LOGIC Since this work wishes to demonstrate the positive outcome of philosophy, the reader may ask the author what are his proofs that instead of the quintessence of thousands of years of philosophical work he is not offered the elaboration of any individual philosopher, or even that of the author himself. In reply I wish to say that my work would be rendered uselessly voluminous by quotations from the works of the most prominent philosophical writers, without proving anything, since the words of one often contradict those of another.