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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

From James Croll   4 February 1869

Summary

Argues for great age of earth before the Cambrian period. Opposes measuring age from secular cooling. Opposes Sir William Thomson. Lyell’s error on secular cooling.

Thanks for Moseley citation ["On the mechanical possibility of the descent of glaciers", Proc. R. Soc. Lond. 17 (1869): 202–8].

In Edinburgh he feels out of touch with latest developments.

Author:  James Croll
Addressee:  Charles Robert Darwin
Date:  4 Feb 1869
Classmark:  DAR 161: 263
Letter no:  DCP-LETT-6599

From James Croll   15 February 1869

Summary

Thanks for abstract of Moseley’s paper on motion of glaciers [see 6599]. Reading it convinced him that Tyndall’s received view is wrong. Has formed a new view, which he has sent to Philosophical Magazine [4th ser. 37 (1869): 201–6].

Author:  James Croll
Addressee:  Charles Robert Darwin
Date:  15 Feb 1869
Classmark:  DAR 161: 264
Letter no:  DCP-LETT-6616

From James Croll   23 June 1869

Summary

Thanks for presentation copy of Origin [5th ed.].

Clarifies his point on north and south glacial periods. Supports CD’s view that temperate plants will move up mountains during the alternation.

Author:  James Croll
Addressee:  Charles Robert Darwin
Date:  23 June 1869
Classmark:  DAR 161: 265
Letter no:  DCP-LETT-6799
Document type
letter (6)
Addressee
Correspondent
Croll, James[X]
Darwin, C. R.[X]
Date
1869
01 (1)
02 (4)
06 (1)
letter