Sent by Alfred Russel Wallace, 9 St Mark's Crescent, Regent's Park, NW to Charles Lyell [none given] on 22 March 1869.
No summary available at this time.
A typical letter handwritten by author in English and signed by author.
An original MS
Total Pages : 4
Pages with text: 3
Transcriber: Moody, Liz
Transcription date: January 30, 2013
Scrutiny: 30/01/2013 - Catchpole, Caroline;
Signed off: no
9 St. Mark’s Crescent N.W.
March 22nd 1869
Dear Sir Charles,
I return your Darwins’ letter with thanks. I have read Tyndale’s books on glaciers very carefully, & believe myself’s theory to be quite inconsistent with his & Fabe’s facts. The whole cause and mode of the motion of glaciers seems to be still a mystery, but I do not see that myself’s argument in any way proves it can not be due to gravitation, because his experiment [] on which his theory calculation is entirely founded, is one which seems to have been made under conditions such as never occur in a glacier.
Dr [Hull] has returned the proof, but I am sorry to say has insisted on cutting out the last par. & quotation, on the grounds that it interferes with the effect of the concluding theory. I have taken out altogether the passage about the erect trees of supposed post glacial age, as there seems so much doubt about the [] facts.
On the question of glaciers, -- Tyndale puts among his ascertained facts a conclusion, that a mass of ice, even on a level, will be spread out over the surface by [supericumbent?] pressure, and of course must spread on the side of greatest slope of the ground. This will of course apply to the case of a glacier at or near a watershed supposing its thickness was great at that elevations.
Wishing you a pleasant Easter tour.
Believe me| Yours very truly | Alfred R. Wallace [signature]
Sir C. Lyell Bart.
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