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40

must have involved from the beginning
certain tendencies to think truly about
physics, on the one hand, and about psychics,
on the other. It is somehow more than a
mere figure of speech to say that nature
fecundates the mind of man with ideas
which when those ideas grow up, will resemble
their father, Nature.

But if that be so, it must be good
reasoning to say that a given hypothesis is good,
as a hypothesis, because it is a
natural one, or one readily embraced
by the human mind. It must concern
logic in the highest degree to
ascertain precisely how far and under