If we compare the old Grecian wisdom with modern science, the outcome of philosophy looks insignificant by the side of the achievements of science. Nevertheless, great as the value of the aggregate product of science may be, it is composed of individual values, and every one of its parts is worthy of consideration. The method, the way, the form, in which the mind arrives at its practical creations is one of these parts. The mind, on its march from ignorance to its present wealth has not only gathered a treasury of knowledge, but also improved its methods, so that the further constructive work of science proceeds faster now. Who will fail to recognize that material production has accumulated a treasure in the methods by which it produces to-day, which is by no means of less value than the accumulated national wealth itself? The positive outcome of philosophy bears the same relation to the wealth of science. II THE POWER OF COGNITION IS KIN TO THE UNIVERSE The way of Truth, or the true way, is not musing, but the conscious connection of our thoughts with the actual life--that is the quintessence of the teachings of philosophy produced by evolution. But this is not everything. If I know that a tanner makes leather, I do not by any means know everything he does, because there still remains the manner and method of his manipulations. In the same way, the doctrine of the interrelation of mind and matter, which is the product of the entire social development, requires a better and more specific substantiation, so that its true quality as a positive achievement of philosophy, or of the theory of knowledge may be better understood. If the matter is represented in this bare manner--it does, indeed, resemble the egg of Columbus--one does not see why so much should be made of it. But if we enter into the details that have produced the result, we do not only learn to better respect the prominent philosophers, but their works also reveal a rich mine of special and comprehensive knowledge. All sciences are closely related, for advances in one branch are preparations for advances in others. Astronomy is unthinkable without mathematics and optics. Every science has begun unscientifically, and in the course of the accumulation of individual knowledge a more or less exact systematic organization of this knowledge has resulted. No science has as yet arrived at completeness and perfectness. We have as yet more the results of experimental effort than accomplished perfection. Philosophy is no better off in this respect. We rather believe we are doing something to overcome a deeply rooted prejudice when we state that philosophy is no worse off than other sciences, so long as we succeed in ascertaining that it has accomplished positive results and in pointing them out.