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writer on metaphysics has a great deal against him. Engaged on a subject which more than others demands peace of spirit, even before he enters on the controversies of his own field, he finds himself involved in a sort of warfare. He is confronted by prejudices hostile to his study, and he is tempted to lean upon those prejudices, within him and around him, which seem contrary to the first. It is on the preconceptions adverse to metaphysics in general that I am going to make some remarks by way of introduction. We may agree, perhaps, to understand by metaphysics an attempt to know reality as against mere appearance, or the study of first principles or ultimate truths, or again the effort to comprehend the universe, not simply piecemeal or by fragments, but somehow as a whole. Any such pursuit will encounter a number of objections. It will have to hear that the knowledge which it desires to obtain is impossible altogether; or, if possible in some degree, is yet practically useless; or that, at all events, we can want nothing beyond the old philosophies. And I will say a few words on these arguments in their order.

(a) The man who is ready to prove that metaphysical knowledge is wholly impossible has no right here to any answer. He must be referred for conviction to the body of this treatise. And he can hardly refuse to go there, since he himself has, perhaps unknowingly, entered the arena. He is a brother metaphysician with a rival theory of first