This extravagant praise becomes even absurd when the writer gravely says that this book “had simply killed metaphysic.” A popular style and method gave the book success, along with the fact that the temper of the time made such a statement acceptable. It cleverly indicated the weak places in the metaphysical methods, and it presented the advantages of the inductive method with great eloquence and ingenuity. Its satire, and its contempt for the more spiritualistic systems, also helped to make it readable.
His later work, in which he develops his own positive conclusions, has the merit of being one of the best expositions yet made of the philosophy of evolution. In view, however, of his unqualified condemnation of the theories of metaphysicians, his system is one of singular audacity of speculation. Not even Schelling or Hegel has gone beyond him in theorizing, or exceeded him in the ground traversed beyond the limits of demonstration. He who had held up all speculative systems to scorn, distanced those he had condemned, and showed how easy it is to take theory for fact. Metaphysic has not had in its whole history a greater illustration of the daring of speculation than in the case of Lewes’s theory of the relations of the subjective and objective. He interprets matter and mind, motion and feeling, objective and subjective, as simply the outer and inner, the concave and convex, sides of one and the same reality. Mind is the same as matter, except that it is viewed from a different aspect. In this opinion he resembles Schelling more than any other thinker, as he does in some other of his speculations. As a monist,