Yet, as they both do vary in successive generations--as is seen
under domestication--and are correlated, we can only adduce the fact.
Darwin may be precluded from our answer, but we may say that they vary
together because designed to do so. A reviewer says that the chance of
their varying together is inconceivably small; yet, if they do not, the
variant individuals must all perish. Then it is well that it is not
left to chance. To refer to a parallel case: before we were born,
nourishment and the equivalent to respiration took place in a certain
way. But the moment we were ushered into this breathing world, our
actions promptly conformed, both as to respiration and nourishment, to
the before unused structure and to the new surroundings.
"Now," says the Examiner, "suppose, for instance, the gills of an
aquatic animal converted into lungs, while instinct still compelled a
continuance under water, would not drowning ensue?" No doubt.
But--simply contemplating the facts, instead of theorizing--we notice
that young frogs do not keep their heads under water after ceasing to
be tadpoles. The instinct promptly changes with the structure, without
supernatural interposition--just as Darwin would have it, if the
development of a variety or incipient species, though rare, were as
natural as a metamorphosis.
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