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DCP-LETT-590

From:
Charles Robert Darwin
To:
Charles Lyell, 1st baronet
Date:
[21 Feb – 4 Apr 1841]
Source of text:
American Philosophical Society (Mss.B.D25.26)
Summary:

Answers a number of queries from Lyell concerning geography and geology of Chiloé Island and its relationship to the Cordilleras.

Asks about "perched rocks" on Jura and notes their relevance to Louis Agassiz’s theory. Discusses Agassiz’s view on Jura.

Mentions seeing Robert Brown.

Notes R. I. Murchison’s discovery of shells in central England.

Weakness of negative evidence.

Contributor:
Darwin Correspondence Project

DCP-LETT-592

From:
Charles Robert Darwin
To:
Charles Lyell, 1st baronet
Date:
[Mar 1841]
Source of text:
American Philosophical Society (Mss.B.D25.27)
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.

Contributor:
Darwin Correspondence Project

DCP-LETT-594

From:
Charles Robert Darwin
To:
Charles Lyell, 1st baronet
Date:
[9 Mar 1841]
Source of text:
American Philosophical Society (Mss.B.D25.23)
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.

Contributor:
Darwin Correspondence Project

DCP-LETT-595

From:
Charles Robert Darwin
To:
Charles Lyell, 1st baronet
Date:
[12 Mar 1841]
Source of text:
American Philosophical Society (Mss.B.D25.25)
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].

Contributor:
Darwin Correspondence Project
Text Online

HENSLOW-1134

From:
Charles Lyell
To:
J. S. Henslow
Date:
10 April 1841
Source of text:
American Philosophical Society Library The Scientists Collection I 509.L56
Summary:

No summary available.

Contributor:
Henslow Correspondence Project
Text Online

HENSLOW-1018

From:
William Clark
To:
J. S. Henslow
Date:
22 May 1841
Source of text:
American Philosophical Society Library Mss.B.H382
Summary:

No summary available.

Contributor:
Henslow Correspondence Project

DCP-LETT-602

From:
Charles Robert Darwin
To:
Charles Lyell, 1st baronet
Date:
6 [July 1841]
Source of text:
American Philosophical Society (Mss.B.D25.24)
Summary:

Discusses various types of coral reefs on which he has been collecting notes. Views of C. G. Ehrenberg. His conception of the formation of Bermuda.

Pessimistic about the effect of his poor health on his scientific work.

Contributor:
Darwin Correspondence Project
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