Natural Philosophy is no longer—according to Hegel’s view of it—merely a scheme of mathematical ground-work. That may be its first step. But its scope is a complete unity (which is not a mere aggregate) of the branches of natural knowledge, exploring both the inorganic and the organic world. In dealing with this endless problem, philosophy seems to be baulked by an impregnable obstacle to its progress. Every day the advance of specialisation renders any comprehensive or synoptic view of the totality of science more and more impossible. No doubt we talk readily enough of Science. But here, if anywhere, we may say there is no Science, but only sciences. The generality of science is a proud fiction or a gorgeous dream, variously told and interpreted according to the varying interest and proclivity of the scientist. The sciences, or those who specially expound them, know of no unity, no philosophy of science. They are content to remark that in these days the thing is impossible, and to pick out the faults in any attempts in that direction that are made outside their pale. Unfortunately for this contention, the thing is done by us all, and, indeed, has to be done. If not as men of science, yet as men—as human beings—we have to put together things and form some total estimate of the drift of development, of the unity of nature. To get a notion, not merely of the general methods and principles of the sciences, but of their results and teachings, and to get this not as a mere lot of fragments, but with a systematic unity, is indispensable in some degree for all rational life. The life not founded on science is not the life of man. But he will not find what he wants in the text-books of the specialist, who is obliged to treat his subject, as Plato says, “under the pressure of necessity,” and who dare not look on it in its quality “to draw the soul towards truth, and to form the philosophic intellect so as to uplift what we now unduly keep down(1).” If the philosopher in this province does his work but badly, he may plead the novelty of the task to which he comes as a pioneer or even an architect. He finds little that he can directly utilise. The materials have been gathered and prepared for very special aims; and the great aim of science—that human life may be made a higher, an ampler, and happier thing,—has hardly been kept in view at all, except in its more materialistic aspects. To the philosopher the supreme interest of the physical sciences is that man also belongs to the physical universe, or that Mind and Matter as we know them are (in Mr. Spencer’s language) “at once antithetical and inseparable.” He wants to find the place of Man,—but of Man as Mind—in Nature.