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To James Croll   9 August 1877

Summary

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

Author:  Charles Robert Darwin
Addressee:  James Croll
Date:  9 Aug 1877
Classmark:  DAR 143: 356
Letter no:  DCP-LETT-11097

To James Croll   19 September 1868

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.

Author:  Charles Robert Darwin
Addressee:  James Croll
Date:  19 Sept 1868
Classmark:  DAR 143: 352
Letter no:  DCP-LETT-6380

To James Croll   24 November 1868

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].

Author:  Charles Robert Darwin
Addressee:  James Croll
Date:  24 Nov 1868
Classmark:  DAR 143: 353
Letter no:  DCP-LETT-6473

To James Croll   4 December [1868]

Summary

Acknowledges receipt of book and manuscript.

Author:  Charles Robert Darwin
Addressee:  James Croll
Date:  4 Dec [1868]
Classmark:  American Philosophical Society (Mss.B.D25.)
Letter no:  DCP-LETT-6491

To James Croll   10 January 1869

Summary

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

Author:  Charles Robert Darwin
Addressee:  James Croll
Date:  10 Jan 1869
Classmark:  J. C. Irons 1896, p. 215
Letter no:  DCP-LETT-6547F

To James Croll   31 January [1869]

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.

Author:  Charles Robert Darwin
Addressee:  James Croll
Date:  31 Jan [1869]
Classmark:  American Philosophical Society (Mss.B.D25.361)
Letter no:  DCP-LETT-6585

To James Croll   6 February [1869]

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.

Author:  Charles Robert Darwin
Addressee:  James Croll
Date:  6 Feb [1869]
Classmark:  American Philosophical Society (Mss.B.D25.)
Letter no:  DCP-LETT-6603

To James Croll   24 February [1869]

Summary

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

Author:  Charles Robert Darwin
Addressee:  James Croll
Date:  24 Feb [1869]
Classmark:  American Philosophical Society (Mss.B.D25.271)
Letter no:  DCP-LETT-6630

To James Croll   19 July [1871]

Summary

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

Author:  Charles Robert Darwin
Addressee:  James Croll
Date:  19 July [1871]
Classmark:  Wellcome Collection (MS.7781/1–32 item 27)
Letter no:  DCP-LETT-7874
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Darwin, C. R.disabled_by_default
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1868 (3)
1869 (4)
1871 (1)
1877 (1)