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 ideal stability—for there is constancy in their motions and transformations—to make the intelligible external world of practice and science. Whatever stuff has not been absorbed in this construction, whatever facts of sensation, ideation, or will, do not coalesce with the newest conception of reality, we then call the mind.

Raw experience, then, lies at the basis of the idea of nature and approves its reality; while an equal reality belongs to the residue of experience, not taken up, as yet, into that idea. But this residual sensuous reality often seems comparatively unreal because what it presents is entirely without practical force apart from its mechanical associates. This inconsequential character of what remains over follows of itself from the concretion of whatever is constant and efficacious into the external world. If this fact is ever called in question, it is only because the external world is vaguely conceived, and loose wills and ideas are thought to govern it by magic. Yet in many ways falling short of absolute precision people recognise that thought is not dynamic or, as they call it, not real. The idea of the physical world is the first flower or thick cream of practical thinking. Being skimmed off first and proving so nutricious, it leaves the liquid below somewhat thin and unsavoury. Especially does this result appear when science is still unpruned and mythical, so that what passes into the idea of material nature is much more than the truly causal network of