[56] Your resume of
glacier action seems to me very good, and has interested my brother
much, and as the subject is new to him he is a better judge. That is
quite a new and perplexing point which you specify about the freshwater
fishes during the glacial period.
I have also been very glad to see the article on Lyell, which seems to
me to be done by some good man.
I forgot to say when with you--but I then indeed did not know so much as
I do now--that the sexual, i.e. _ornamental_, differences in fishes,
which differences are sometimes very great, offer a difficulty in the
wide extension of the view that the female is not brightly coloured on
account of the danger which she would incur in the propagation of the
species.
I very much enjoyed my long conversation with you; and to-day we return
home, and I to my horrid dull work of correcting proof-sheets.--Believe
me, my dear Wallace, yours very sincerely,
CHARLES DARWIN.
P.S.--I had arranged to go and see your collection on Saturday evening,
but my head suddenly failed after luncheon, and I was forced to lie down
all the rest of the day.
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