raphical MS.
till you hear from me, for I may have to beg you to send it to Murray;
as through Lyell's intervention I hope he will publish, but he requires
first to see MS. (344/1. "The Origin of Species"; see a letter to Lyell
in "Life and Letters," II., page 151.)

I demur to what you say that we change climate of the world to account
for "migration of bugs, flies, etc." WE do nothing of the sort; for WE
rest on scored rocks, old moraines, arctic shells, and mammifers. I have
no theory whatever about cause of cold, no more than I have for cause of
elevation and subsidence; and I can see no reason why I should not use
cold, or elevation, or subsidence to explain any other phenomena, such
as distribution. I think if I had space and time I could make a pretty
good case against any great continental changes since the Glacial
epoch, and this has mainly led me to give up the Lyellian doctrine as
insufficient to explain all mutations of climate.

I was amused at the British Museum evidence. (344/2. This refers to the
letter to Murchison (Letter 65), published with the evidence of the 1858
enquiry by the Trustees of the British Museum.) I am made to give my
opinion so authoritatively on botanical matters!...

As for our belief in the origin of species making any difference in
descriptive work, I am sure it is incorrect, for I did all my barnacle
work under this point of view. Only I often groaned that I was not
allowed simply to decide whether a difference was sufficient to deserve
a name.

I am glad to hear about Huxley--a wonderful man.

LETTER 345. TO J.D. HOOKER. Wells Terrace, Ilkley, Otley, Yorkshire,
Thursday [before December 9th, 1859].

I have read your discussion (345/1. See "Introductory Essay," page
c. Darwin did not receive this work until December 23rd, so that the
reference is to proof-sheets.), as usual, with great interest. The
points are awfully intricate, almost at present beyond the confines
of knowledge. The view which I should have looked at as perhaps most
probable (though it hardly differs from yours) is that the whole world
during the Secondary ages was inhabited by marsupials, araucarias
(Mem.--Fossil wood so common of this nature in South America (345/2.
See Letter 6, Note.)), Banksia, etc.; and that these were supplanted and
exterminated in the greater area of the north, but were left alive in
the south. Whence these very ancient forms originally proceeded seems a
hopeless enquiry.

Your