Your idea about colour being concentrated in the smaller males seems
good, and I presume that you will not object to my giving it as your
suggestion.--Believe me, my dear Wallace, with many thanks, yours very
sincerely,
CH. DARWIN.
* * * * *
Wallace's more recent views on the question of Natural Selection and
Sterility may be found in a note written by him in 1899: "When writing
my 'Darwinism' and coming again to the consideration of the problem of
the effect of Natural Selection in accumulating variations in the amount
of sterility between varieties or incipient species, twenty years later,
I became more convinced than I was when discussing with Darwin, of the
substantial accuracy of my argument. Recently a correspondent who is
both a naturalist and a mathematician has pointed out to me a slight
error in my calculation at p, 183 (which does not, however, materially
affect the result) disproving the physiological selection of the late
Dr. Romanes, but he can see no fallacy in my argument as to the power of
Natural Selection to increase sterility between incipient species, nor,
so far as I am aware, has anyone shown such fallacy to exist.
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