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From B. D. Walsh [before 31 October 1868]
Summary
Beginning of extract from William Dell Hartman’s "Journal of the doings of Cic[ada?] septemdecim" [unidentified] in Pennsylvania in 1851.
Author: | Benjamin Dann Walsh |
Addressee: | Charles Robert Darwin |
Date: | [before 31 Oct 1868] |
Classmark: | DAR 81: 145 |
Letter no: | DCP-LETT-5755 |
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 |
Author
Darwin, C. R. | (1) |
Walsh, B. D. | (1) |
Addressee
Darwin, C. R. | (1) |
Walsh, B. D. | (1) |