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 constitute the base of this latter part, and will serve for heads, as it were, of discourse. But let it be noted with regard to substance (which might seem rather to pertain to the First Part) that we shall consider it metaphysically alone, and not physically. And as in the former Part we dissected and examined it as a chirurgeon dissects and examines the brain, so now we shall examine it as a metaphysician examines the mind.

So much, then, by way of Preface to the things which are about to be said.