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From:
Charles Robert Darwin
To:
James Croll
Date:
19 Sept 1868
Source of text:
DAR 143: 352
Summary:

Discusses papers by JC dealing with erosion. Comments on papers on the subject by J. B. Jukes, A. C. Ramsay, and William Whitaker. Formerly believed in power of the sea. Never fully realised the truth until reading JC’s papers.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
James Croll
Date:
24 Nov 1868
Source of text:
DAR 143: 353
Summary:

Comments on glaciers in North America.

Asks if glacial periods have occurred alternately in the Northern and Southern Hemispheres. Relevant to his glacial discoveries in South America: "it would have been an immense relief to my mind if I could have assumed … this". CD wishes to discuss subject in new edition of Origin [5th].

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
James Croll
Date:
4 Dec [1868]
Source of text:
American Philosophical Society (Mss.B.D25.)
Summary:

Acknowledges receipt of book and manuscript.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
James Croll
Date:
10 Jan 1869
Source of text:
J. C. Irons 1896 , p. 215
Summary:

Apologises for having kept JC’s book so long; would like to keep it about ten days more.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
James Croll
Date:
31 Jan [1869]
Source of text:
American Philosophical Society (Mss.B.D25.361)
Summary:

Returns book with thanks. "Joyfully accepts" idea of the warming of Southern Hemisphere during glacial period in the Northern. Lyell is unwilling.

Mentions H. N. Moseley’s study of descent of glaciers [Proc. R. Soc. Lond. 17 (1869): 202–8].

CD greatly troubled by problem of age of the earth and calculations of Sir William Thomson. Asks about changes in the form of the globe.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
James Croll
Date:
6 Feb [1869]
Source of text:
American Philosophical Society (Mss.B.D25.)
Summary:

Consoling to CD that JC gives "a little more age to the world".

Cites article by Henry Moseley ["On the mechanical possibility of the descent of glaciers", Proc. R. Soc. Lond. 17 (1869): 202–8].

Mentions article by A. R. Clarke on shape of the globe.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
James Croll
Date:
24 Feb [1869]
Source of text:
American Philosophical Society (Mss.B.D25.271)
Summary:

Thanks JC for his proofs of article on the movement of glaciers.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
James Croll
Date:
19 July [1871]
Source of text:
Wellcome Collection (MS.7781/1–32 item 27)
Summary:

Introduces E. L. Youmans to correspondent. Youmans is seeking small monographs by the most competent English authors [for his International Scientific Series].

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
James Croll
Date:
9 Aug 1877
Source of text:
DAR 143: 356
Summary:

Comments on JC’s paper ["On the tidal retardation argument for the age of the earth", Rep. BAAS (1876): 88–9].

Contributor:
Darwin Correspondence Project