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Elizabeth Cary Agassiz, Louis Agassiz: his life and correspondence, third edition, Chapter 11: 1842-1843: Aet. 35-36. (search)
me at the adhesion of C. Darwin to the doctrine of ancient glaciers in North Wales, of which I send you a copy, and which was communicated to me by Dr. Tritten, during the late meeting at Manchester, in time to be quoted by me versus Murchison, when he was proclaiming the exclusive agency of floating icebergs in drifting erratic blocks and making scratched and polished surfaces. It has raised the glacial theory fifty per cent., as far as relates to glaciers descending inclined valleys; but Hopkins and the Cantabrigians are still as obstinate as ever against allowing the power of expansion to move ice along great distances on horizontal surfaces. . . . The following is the letter referred to above. C. Darwin to Dr. Tritten. Yesterday (and the previous days) I had some most interesting work in examining the marks left by extinct glaciers. I assure you, an extinct volcano could hardly leave more evident traces of its activity and vast powers. I found one with the lateral mo