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Darwin Correspondence Project
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1868::10::31 in date [X]
1868::10::31 in date [X]
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From B. D. Walsh   [before 31 October 1868]

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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

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

From Fritz Müller   31 October 1868

Summary

Writes on various observations and discoveries on dimorphic and trimorphic plants.

Author:  Johann Friedrich Theodor (Fritz) Müller
Addressee:  Charles Robert Darwin
Date:  31 Oct 1868
Classmark:  DAR 142: 98, 103
Letter no:  DCP-LETT-6439

From Samuel Owen Glenie to G. H. K. Thwaites   [before 31 October 1868]

Summary

Relates some observations on the expression of elephants; they do not cry unless the eye is hurt or struck. "Perhaps Mr Darwin will like to know the above."

Author:  Samuel Owen Glenie
Addressee:  George Henry Kendrick Thwaites
Date:  [before 31 Oct 1868]
Classmark:  DAR 165: 55
Letter no:  DCP-LETT-6440