I QUITE agree with Mr. Spencer that argument between us will not be to much purpose; but it should be noted that my principal “exemplification of unconsciously-formed preconceptions” was of Mr. Spencer's own choosing, namely, Newton's “Second Law of Motion,” which, if I understand him aright, may now be described as “a consciously-formed hypothesis concerning the relation between weight (force?) and motion.” Only demurring to the word “hypothesis,” and leaving it to Mr. Spencer to reconcile this with his former declaration that the law in question is an “immediate corollary” of one of these unconsciously-formed preconceptions, it seems to me there is little left to argue about.
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HAYWARD, R. Mr. Spencer and à priori Axioms. Nature 10, 25 (1874). https://doi.org/10.1038/010025a0