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 |
To Leonard Jenyns [14 or 21 August 1846]
Summary
Looks forward to LJ’s volume [Observations in natural history (1846)].
Observations on what the world would call trifling points in natural history are always very interesting to him. Deplores their absence in foreign periodicals.
Is slaving away to finish S. American geology.
| Author: | Charles Robert Darwin |
| Addressee: | Leonard Jenyns; Leonard Blomefield |
| Date: | [14 or 21] Aug 1846 |
| Classmark: | Bath Royal Literary and Scientific Institution |
| Letter no: | DCP-LETT-987 |
To Leonard Jenyns 17 October [1846]
Summary
Comments on LJ’s Observations [in natural history (1846)].
Discusses variation among British birds, and the conflicting treatment of bird species by C. W. L. Gloger and C. L. Brehm.
Describes collecting incident of his student days involving Carabus.
Mentions squirrels eating insects.
Astonished to hear of terrestrial Planaria.
Comments on BAAS meeting in Southampton.
| Author: | Charles Robert Darwin |
| Addressee: | Leonard Jenyns; Leonard Blomefield |
| Date: | 17 Oct [1846] |
| Classmark: | Bath Royal Literary and Scientific Institution |
| Letter no: | DCP-LETT-1009 |
| letter | (4) |
| Darwin, C. R. | (4) |
| Blomefield, Leonard | (2) |
| Horner, Leonard | (2) |
| Jenyns, Leonard | (2) |
| Darwin, C. R. | (4) |
| Blomefield, Leonard | (2) |
| Horner, Leonard | (2) |
| Jenyns, Leonard | (2) |
