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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 |
