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 and there is a doubt, therefore, whether any such localization is necessary. And, for myself, I am unable to perceive that it is so. Certainly, if I try to imagine an unextended world of this kind, I admit that, against my will, I give it a spatial character. But, so far as I see, this may arise from mere infirmity; and the idea of an unextended Nature seems, for my knowledge at least, not self-contradictory.

But, having gone as far as this, I am unable to go farther. A Nature without extension I admit to be possible, but I can discover no good reason for taking it as actual. For the physical world, which we encounter, is certainly spatial; and we have no interest in trying to seek out any other. If Nature on our view were reality, the case would be altered; and we should then be forced to entertain every doubt about its essence. But for us Nature is appearance, inconsistent and untrue; and hence the supposition of another Nature, free from extension, could furnish no help. This supposition does not remove the contradictions from actual extension, which in any case is still a fact. And, again, even within itself, the supposition cannot be made consistent with itself. We may, therefore, pass on without troubling ourselves with such a mere possibility. We cannot conclude that all Nature essentially must have extension. But, since at any rate our physical world is extended, and since the hypothesis of another kind of Nature has no interest, that idea may be dismissed. I shall henceforth take Nature as appearing always in the form of space.

Let us return from this digression. We are to