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To Charles Lyell [March 1841]
Summary
Discusses the role of ice in determining the geological features of the Jura. Mentions view of Agassiz. Objects to idea of "a [sea of ice] carrying rocks". Notes Agassiz’s earlier view of "ice expanded in the line of the Great Swiss Valley". Comments on Pentlands.
| Author: | Charles Robert Darwin |
| Addressee: | Charles Lyell, 1st baronet |
| Date: | [Mar 1841] |
| Classmark: | American Philosophical Society (Mss.B.D25.27) |
| Letter no: | DCP-LETT-592 |
To Charles Lyell [9 March 1841]
Summary
Defends his theory [in "Parallel roads of Glen Roy" (1839), Collected papers 1: 87–137] against the view that the "roads" were formed by glacial action.
| Author: | Charles Robert Darwin |
| Addressee: | Charles Lyell, 1st baronet |
| Date: | [9 Mar 1841] |
| Classmark: | American Philosophical Society (Mss.B.D25.23) |
| Letter no: | DCP-LETT-594 |
To Charles Lyell [12 March 1841]
Summary
Discusses at length Louis Agassiz’s book [Études sur les glaciers (1840)] and Agassiz’s explanation of moraines. Defends his own theory of the importance of floating ice. Relates glacier theory to his own interpretation of Glen Roy.
Mentions a paper he is writing on South American boulders and till [Collected papers 1: 145–63].
| Author: | Charles Robert Darwin |
| Addressee: | Charles Lyell, 1st baronet |
| Date: | [12 Mar 1841] |
| Classmark: | American Philosophical Society (Mss.B.D25.25) |
| Letter no: | DCP-LETT-595 |
