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To Leonard Horner [23 December 1846 – January 1847]
Summary
Responds to LH’s comments on South America.
Thinks it unsound to designate a geological epoch after man. Doubts people’s confidence in date of man’s introduction.
Criticises A. D. d’Orbigny’s theory of elevation of the Cordillera.
Lists sections of South America of special interest.
| Author: | Charles Robert Darwin |
| Addressee: | Leonard Horner |
| Date: | [23 Dec 1846 – Jan 1847] |
| Classmark: | DAR 145: 138 |
| Letter no: | DCP-LETT-977 |
To Leonard Horner [17 August – 7 September 1846]
Summary
Discusses proposed survey of Glen Roy. Mentions Glen Roy theories of Agassiz and William Buckland. Includes a memorandum calling for a careful survey of the parallel roads of Glen Roy. Mentions M. A. Bravais ["On the lines of ancient level of the sea in Finmark", Q. J. Geol. Soc. Lond. 1 (1845): 534].
| Author: | Charles Robert Darwin |
| Addressee: | Leonard Horner |
| Date: | [17 Aug – 7 Sept 1846] |
| Classmark: | American Philosophical Society (Mss.B.D25.53); DAR 145: 136–7 (enclosure) |
| Letter no: | DCP-LETT-993 |
Addressee
| Horner, Leonard | (2) |
