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The Darwin debate is forever subject to a kind of 'slippage' in its terms
of discourse as discussion shifts gear between rejection of the very existence
of evolution and the claims, given the facts of evolution, for its dynamic,
mechanism, or explanation. Sometimes the failure of the proposed mechanism to
explain is taken as grounds for rejecting evolution, or else the evidence of
evolution is taken as given, and, quite properly, the demand is made for a new
explanation of the mechanism. We should note that the real success of Darwin in
the wake of the publication of his Origin was one of publicity for the
evidence of evolution. Slowly gestating over the course of the late eighteenth
and early nineteenth century, the idea of 'evolution', often called 'transformation',
was clearly in the air, indeed decisively accepted and championed in many
quarters, and in fact the 'bestseller' syndrome had already happened before, as
the idea reached the threshold of public awareness in the immediately antecedent
wave of publicity seen in Chambers' Vestiges. The latter work
demonstrated the dilemma, falsely resolved we should think by Darwin, of
inchoate and less than professionally scientific intuitions with a
cow-catcher full of disparate notions seizing on the idea of evolution as a fact
of nature. We might dismiss Chambers only to rediscover that his ear lay to the
ground with respect to the implications of the generation of embryologists,
whose findings preempted easy resolution of the debate over transformation.
Huxley is a good example of the way these considerations had, perhaps, delayed
the sudden 'gestalt' of evolution as fact that animated Darwin's crystallization
destined to finally reach a larger public, but one cast in the secondary
promotion of natural selection as the defining explanatory framework for the
mechanism. Clearly influenced by these earlier efforts, Huxley switched
'gestalts' as he saw that the answer was evolution, whatever the case with the
embryologists, but not necessarily, as he warned Darwin, natural
selection.
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