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To Henry Michael Jenkins   [after 1 October 1868]


Feels there is little he could say as a testimonial for HMJ.

Author:  Charles Robert Darwin
Addressee:  Henry Michael Jenkins
Date:  [after 1 Oct 1868]
Classmark:  DAR 96: 50
Letter no:  DCP-LETT-6402

To A. R. Wallace   6 October [1868]


Sexual selection, protection.

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  6 Oct [1868]
Classmark:  The British Library (Add MS 46434: 162–3)
Letter no:  DCP-LETT-6412

To John Tyndall   7 October 1868


Asks JT to distribute some circulars about the work of Gustavus Hinrichs of Iowa, whom CD wishes to help.

Admires JT’s Norwich address [to Mathematics and Physics Section, BAAS meeting, Rep. BAAS 38: 1–6] and his Fortnightly Review paper on scientific discovery [7 (1867): 645–60].

Author:  Charles Robert Darwin
Addressee:  John Tyndall
Date:  7 Oct 1868
Classmark:  DAR 261.8: 5 (EH: 88205943)
Letter no:  DCP-LETT-6413

To Hermann Müller   9 October 1868


Pleased HM says good words for Pangenesis.

Author:  Charles Robert Darwin
Addressee:  Heinrich Ludwig Hermann (Hermann) Müller
Date:  9 Oct 1868
Classmark:  DAR 146: 431
Letter no:  DCP-LETT-6415

To Adam Sedgwick   13 October 1868


Thanks AS for congratulations on George Darwin’s Trinity fellowship.

Reminiscence of his geological tour of North Wales with AS and the encouraging messages received during the Beagle voyage.

Author:  Charles Robert Darwin
Addressee:  Adam Sedgwick
Date:  13 Oct 1868
Classmark:  Mrs Romney Sedgwick (private collection)
Letter no:  DCP-LETT-6418

To J. J. Weir   17 October 1868


Enjoyed JJW’s visit.

Interested in changes in plumage of pheasants.

Still at work on sexual selection in birds.

Author:  Charles Robert Darwin
Addressee:  John Jenner Weir
Date:  17 Oct 1868
Classmark:  DAR 148: 320
Letter no:  DCP-LETT-6422

To John Tyndall   20 October 1868


Invites JT to come to Down with the Asa Grays and Hookers.

Author:  Charles Robert Darwin
Addressee:  John Tyndall
Date:  20 Oct 1868
Classmark:  DAR 261.8: 6 (EH: 88205944)
Letter no:  DCP-LETT-6424

To W. D. Fox   21 October [1868]


Reminds WDF to write about the "great magpie marriage". Sexual selection an "everlasting subject".

News of his children.

Asks for information on instances of sexual preference in animals and data on numbers of males and females born in various domesticated species.

Author:  Charles Robert Darwin
Addressee:  William Darwin Fox
Date:  21 Oct [1868]
Classmark:  Christ’s College Library, Cambridge (MS 53 Fox 149); DAR 266
Letter no:  DCP-LETT-6426

To August Weismann   22 October 1868


Fears copy of AW’s publication [Über die Berechtigung der Darwin’schen Theorie (1868)] lost in mail. Asks for another.

Glad AW approves of his work

and objects to Nägeli’s law of perfection.

Thinks Moritz Wagner overrates necessity for emigration and isolation.

Author:  Charles Robert Darwin
Addressee:  Leopold Friedrich August (August) Weismann
Date:  22 Oct 1868
Classmark:  DAR 148: 341
Letter no:  DCP-LETT-6427

To Karl von Scherzer   25 October 1868


Thanks KvS for information about expression.

Author:  Charles Robert Darwin
Addressee:  Karl von Scherzer
Date:  25 Oct 1868
Classmark:  American Philosophical Society (Mss.B.D25.356)
Letter no:  DCP-LETT-6429

To G. H. K. Thwaites   26 October [1868]


Encloses Queries about expression.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  26 Oct [1868]
Classmark:  American Philosophical Society (Mss.B.D25.335)
Letter no:  DCP-LETT-6431

To T. H. Farrer   29 October [1868]


Suggests THF write a paper on violets. Asa Gray, once a sceptic, now declares he is convinced whole structure of a flower is adapted for a cross with another individual.

Urges THF not to give up Pangenesis lightly. "It has thrown light on my mind in regard [to] a great series of complex phenomena."

Author:  Charles Robert Darwin
Addressee:  Thomas Henry Farrer, 1st Baron Farrer
Date:  29 Oct [1868]
Classmark:  Linnean Society of London (LS Ms 299/9)
Letter no:  DCP-LETT-6435

To B. D. Walsh   31 October 1868


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]


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