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To B. D. Walsh 31 October 1868
Summary
Thanks BDW for extracts about "drumming" [of male Cicada to attract females].
Asa Gray and Hooker doubt that 13–year and 17–year Cicada forms should be considered distinct species. CD is inclined to agree with them.
Suggests observations be made of ratio of females to males in the rarer form.
| Author: | Charles Robert Darwin |
| Addressee: | Benjamin Dann Walsh |
| Date: | 31 Oct 1868 |
| Classmark: | Field Museum of Natural History, Chicago (Walsh 16) |
| Letter no: | DCP-LETT-6437 |
To Sven Nilsson 31 October [1868]
Summary
Thanks SN for the reference about the reindeer, received via Hooker.
CD wishes to ascertain whether there is any relation between the period of development of a character and its transmission to one sex alone.
| Author: | Charles Robert Darwin |
| Addressee: | Sven Nilsson |
| Date: | 31 Oct [1868] |
| Classmark: | Lund University Library Special Collections (Sven Nilsson papers) |
| Letter no: | DCP-LETT-6438 |
Document type
| letter | (2) |
Addressee
| Nilsson, Sven | (1) |
| Walsh, B. D. | (1) |
Correspondent
| Darwin, C. R. | |
| Nilsson, Sven | (1) |
| Walsh, B. D. | (1) |
