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To Charles Lyell 8 October [1845]
Summary
Discusses American Negroes and their parasitic lice. Henry Denny’s need for lice specimens.
Discusses effects of racial crosses in man.
Describes his trip to Yorkshire.
Comments on Sedgwick’s review [of Vestiges of creation].
Mentions Humboldt’s Kosmos. Criticises Humboldt’s geology.
| Author: | Charles Robert Darwin |
| Addressee: | Charles Lyell, 1st baronet |
| Date: | 8 Oct [1845] |
| Classmark: | American Philosophical Society (Mss.B.D25.46) |
| Letter no: | DCP-LETT-919 |
