I think it would be better to do away with all
such qualifying expressions, and constantly maintain (what I certainly
believe to be the fact) that _variations of every kind_ are _always
occurring_ in _every part_ of _every species_, and therefore that
favourable variations are _always ready_ when wanted. You have, I am
sure, abundant materials to prove this, and it is, I believe, the grand
fact that renders modification and adaptation to conditions almost
always possible. I would put the burthen of proof on my opponents to
show that any one organ, structure, or faculty does _not vary_, even
during one generation, among all the individuals of a species; and also
to show any _mode or way_ in which any such organ, etc., does not vary.
I would ask them to give any reason for supposing that any organ, etc.,
is ever _absolutely identical_ at any _one time in all the individuals_
of a species, and if not, then it is always varying, and there are
always materials which, from the simple fact that the "fittest survive,"
will tend to the modification of the race into harmony with changed
conditions.
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