--Yours very sincerely,
CH. DARWIN.
P.S.--After all, I have thought of one question, but if I receive no
answer I shall understand that (as is probable) you have nothing to say.
I have seen it remarked that the men and women of certain tribes differ
a little in shade or tint; but have you ever seen or heard of any
difference in tint between the two sexes which did not appear to follow
from a difference in habits of life?
* * * * *
_Down, Bromley, Kent, S.E. April 14, 1869._
My dear Wallace,--I have been wonderfully interested by your article,[80]
and I should think Lyell will be much gratified by it. I declare if I
had been editor and had the power of directing you I should have
selected for discussion the very points which you have chosen. I have
often said to younger geologists (for I began in the year 1830) that
they did not know what a revolution Lyell had effected; nevertheless,
your extracts from Cuvier have quite astonished me.
Though not able really to judge, I am inclined to put more confidence in
Croll than you seem to do; but I have been much struck by many of your
remarks on degradation.
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