WALLACE.
P.S.--I will take this opportunity of asking you if you know of any book
that will give me a complete catalogue of vertebrate fossils with some
indication of their affinities.--A.R.W.
* * * * *
_Down, Beckenham, Kent. January 13, 1873._
My dear Wallace,--I have read your review with much interest, and I
thank you sincerely for the very kind spirit in which it is written. I
cannot say that I am convinced by your criticisms.[95] If you have ever
actually observed a kitten sucking and pounding with extended toes its
mother, and then seen the same kitten when a _little older_ doing the
same thing on a soft shawl, and ultimately an old cat (as I have seen),
and do not admit that it is identically the same action, I am
astonished.
With respect to the decapitated frog,[96] I have always heard of Pflueger
as a most trustworthy observer. If, indeed, anyone knows a frog's habits
so well as to say that it never rubs off a bit of leaf or other object,
which may stick to its thigh, in the same manner as it did the acid,
your objection would be valid.
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