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20 is it, you may ask, but a foolish metaphor? And how can such a function be imagined? Isn't the common materialistic notion vastly simpler? Is not consciousness really more comparable to a sort of steam, or perfume, or electricity, or nerve-glow, generated on the spot in its own peculiar vessel? Is it not more rigorously scientific to treat the brain's function as function of production?

The immediate reply is, that, if we are talking of science positively understood, function can mean nothing more than bare concomitant variation. When the brain-activities change in one way, consciousness changes in another; when the currents pour through the occipital lobes, consciousness sees things; when through the lower frontal region, consciousness says things to itself; when they stop, she goes to sleep, etc. In strict science, we can only write down the bare fact of concomitance; and all talk about either production or transmission, as the mode of