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 in the language of Physics and Mechanics. In the school in which I have been trained this is known as Materialism in the strict sense of that word, which I take to be—reasoning about the soul of man, as if its functions were simply those of material units. This degradation of Science is repudiated, not only by Theology and by Metaphysics, but no less emphatically by Positive Philosophy.

The whole series of the human sciences, Psychology, Language, Art, Sociology, History, Economics, Ethic, and Politic—such branches of Knowledge as treat man otherwise than as an animal—have their special laws, their own logic, their own moral fibre, their own spiritual conclusion, quite incommensurable with the non-human sciences. Mechanics, Physics, Chemistry, Biology undoubtedly explain Man as an animal. But they never can explain Man as a loving, sympathetic, social, moral, religious being. This side of Man's nature, the greatest side of his nature, the largest, most dominant, and most sublime fact in all Nature, can only be explained by Social Science, solid Philosophy, true Religion. As the poet saw it in a vision, the last man shall proudly confront in his conscious superiority the waning and unconscious sun. The central and vivifying life-blood of this Social Science, of this Philosophy, of this Religion, must be—not Evolution, or the transformation of the homogeneous into the heterogeneous by continuous differentiation and integration—No! It must complete the development of humanity by Faith, Hope, and Love.

To attempt in any single scheme a Key to all the Sciences is as futile as a 'Key to all the Mythologies.' Matter and Thought are irreducible, for neither can be stated in terms of the other. The same is true of the