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of the early history of science and
all the other facts bearing on the question, which are far too various to be
specifically alluded to in this lecture, I
am quite sure that you must be brought
to acknowledge that man's mind has
a natural adaptation to imagining correct
theories of some kinds, and in particular
to correct theories about forces, without
some glimmer of which he could not
obtain food, and to correct theories about
the human mind, without some glimmer
of which he could not form social ties and
consequently could not reproduce his kind.
In short, the instincts conducive to assimilation
of food, and the instincts conducive to reproduction