From J. D. Hooker 4 August 1856
Summary
JDH’s arguments against transmutation: 1. Plants do not show the confusion he would expect; 2. Under clearly similar physical conditions we do not find same species.
JDH’s argument against migration: commonality of alpine species. Believes migration opposes facts of botanical distribution in Van Diemen’s Land and New Zealand; prefers continental extension theory.
| Author: | Joseph Dalton Hooker |
| Addressee: | Charles Robert Darwin |
| Date: | 4 Aug 1856 |
| Classmark: | DAR 100: 100–4 |
| Letter no: | DCP-LETT-1937 |
To J. D. Hooker 5 August [1856]
Summary
Agrees that Lyell’s letters shed no new light on extensions issue. Continental extensions: opposes their being hypothesised all over world.
Commonality of alpine plants damns both extension and migration.
| Author: | Charles Robert Darwin |
| Addressee: | Joseph Dalton Hooker |
| Date: | 5 Aug [1856] |
| Classmark: | DAR 114: 173 |
| Letter no: | DCP-LETT-1938 |
To J. D. Hooker 7 August [1856]
Summary
Antarctic plants most difficult to account for on any theory. Lyell’s iceberg transportal of seeds.
Are there more representative species of American origin in Tristan da Cunha than in Kerguelen land?
| Author: | Charles Robert Darwin |
| Addressee: | Joseph Dalton Hooker |
| Date: | 7 Aug [1856] |
| Classmark: | DAR 114: 174 |
| Letter no: | DCP-LETT-1940 |
| letter | (3) |
| Darwin, C. R. | (2) |
| Hooker, J. D. | (1) |
| Hooker, J. D. | (2) |
| Darwin, C. R. | (1) |
| Darwin, C. R. | (3) |
| Hooker, J. D. | (3) |
