To Leonard Horner 29 August [1844]
Summary
Thanks Horner for his letter [about Volcanic islands].
Discusses craters of elevation with respect to the views of Leopold von Buch and Élie de Beaumont. Compares Lyell’s views to those of continental geologists. Mentions reading A. D. d’Orbigny [Voyage dans l’Amérique méridionale (1835–47)].
Encloses note from Emma to Mrs Horner, inviting the Horners to visit Down.
| Author: | Charles Robert Darwin |
| Addressee: | Leonard Horner |
| Date: | 29 Aug [1844] |
| Classmark: | American Philosophical Society (Mss.B.D25.38) |
| Letter no: | DCP-LETT-771 |
To Leonard Jenyns 25 [November 1844]
Summary
On checks to increase of species and the observations which led him to regard species as mutable in form. Would welcome "at some future time" LJ’s criticism of the "sketch" of his conclusions.
| Author: | Charles Robert Darwin |
| Addressee: | Leonard Jenyns; Leonard Blomefield |
| Date: | 25 [Nov 1844] |
| Classmark: | Bath Royal Literary and Scientific Institution |
| Letter no: | DCP-LETT-793 |
To Leonard Jenyns 12 October [1844]
Summary
Asks whether LJ can throw light on this subject: "What are the checks and what the periods of life by which the increase of any given species is limited?" CD has been driven to conclude that species are mutable; allied species are co-descendants from common stocks.
| Author: | Charles Robert Darwin |
| Addressee: | Leonard Jenyns; Leonard Blomefield |
| Date: | 12 Oct [1844] |
| Classmark: | Bath Royal Literary and Scientific Institution |
| Letter no: | DCP-LETT-782 |
| letter | (3) |
| Darwin, C. R. | (3) |
| Blomefield, Leonard | (2) |
| Jenyns, Leonard | (2) |
| Horner, Leonard | (1) |
| Darwin, C. R. | (3) |
| Blomefield, Leonard | (2) |
| Jenyns, Leonard | (2) |
| Horner, Leonard | (1) |
