The last one, on the "Glacial
Period in the Southern Hemisphere," in the _Quarterly Journal of
Science_, is particularly fine, and I see he has just read a paper at
the Geological Society. It seems to me supported by quite as much
evidence as Ramsay's "Lakes"; but Ramsay, I understand, will have none
of it--as yet.--Believe me yours very faithfully,
ALFRED R. WALLACE.
* * * * *
_Down, Beckenham, Kent. August 31, 1877._
My dear Wallace,--I am very much obliged to you for sending your
article, which is very interesting and appears to me as clearly written
as it can be. You will not be surprised that I differ altogether from
you about sexual colours. That the tail of the peacock and his elaborate
display of it should be due merely to the vigour, activity, and vitality
of the male is to me as utterly incredible as my views are to you.
Mantegazza published a few years ago in Italy a somewhat similar view. I
cannot help doubting about recognition through colour; our horses, dogs,
fowls, and pigeons seem to know their own species, however differently
the individuals may be coloured.
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