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To Nature   20 September [1873]


CD, in commenting on Wyville Thomson’s "Notes from the Challenger" [Nature 8 (1873): 347–9], recapitulates his work on rudimentary male cirripedes [Living Cirripedia], especially the complementary males attached to hermaphrodites. Offers an explanation, on evolutionary grounds, of their function and size.

Author:  Charles Robert Darwin
Addressee:  Nature
Date:  20 Sept [1873]
Classmark:  Nature, 25 September 1873, pp. 431–2
Letter no:  DCP-LETT-9061

To J. J. Weir   18 September [1873]


JJW is quite at liberty to use CD’s name as patron of cat show.

Author:  Charles Robert Darwin
Addressee:  John Jenner Weir
Date:  18 Sept [1873]
Classmark:  Boston Medical Library in the Francis A. Countway Library of Medicine (B MS Misc.)
Letter no:  DCP-LETT-8524

To Gerard Krefft   [September 1873]


Thanks for observations on worm-castings and for JLGK’s amusing letter.

Wants to know whether species of Eucalyptus are dichogamous. [The P.S. on Eucalyptus may be part of another letter to another correspondent.]

Author:  Charles Robert Darwin
Addressee:  Johann Louis Gerard (Gerard) Krefft
Date:  [Sept 1873]
Classmark:  Mitchell Library, Sydney (MLMSS 5828); Smithsonian Libraries (Dibner Library of the History of Science and Technology MSS 405 A Gift of the Burndy Library)
Letter no:  DCP-LETT-9037

To Theodor Gomperz   1 September [1873]


Will reread and consider TG’s letter when his health improves.

Author:  Charles Robert Darwin
Addressee:  Theodor Gomperz
Date:  1 Sept [1873]
Classmark:  Cedric Hausherr (private collection)
Letter no:  DCP-LETT-9039

To W. D. Fox   1 September [1873]


Has been in bed for some days with ugly head symptoms. "We are a poor lot."

Author:  Charles Robert Darwin
Addressee:  William Darwin Fox
Date:  1 Sept [1873]
Classmark:  Christ’s College Library, Cambridge (MS 53 Fox 152)
Letter no:  DCP-LETT-9040

To Francis Darwin   [4 September 1873]


Asks FD to bring any book that gives the affinities of the various earths, alkalis and metals.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  [4 Sept 1873]
Classmark:  DAR 271.9: 2
Letter no:  DCP-LETT-9040F

To W. W. Baxter   4 September 1873


Orders list of chemical salts. Ashamed to order from Hopkins and Williams because they charge him such an extremely low rate.

Author:  Charles Robert Darwin
Addressee:  William Walmisley Baxter
Date:  4 Sept 1873
Classmark:  John Wilson (dealer) (August 2015)
Letter no:  DCP-LETT-9042

To W. W. Baxter   5 September [1873]


Orders salts of various metals; thinks chlorides (where soluble) would be better than nitrates.

Author:  Charles Robert Darwin
Addressee:  William Walmisley Baxter
Date:  5 Sept [1873]
Classmark:  American Philosophical Society (Mss.B.D25.431)
Letter no:  DCP-LETT-9043

To James Crichton-Browne   7 September [1873]


Thanks JC-B for volume of Asylum reports and paper on epilepsy. Seems clear from reports that physiology of brain will soon be largely understood.

Author:  Charles Robert Darwin
Addressee:  James Crichton-Browne
Date:  7 Sept [1873]
Classmark:  DAR 143: 345
Letter no:  DCP-LETT-9045

To W. W. Baxter   8 September [1873]


Requests chemicals for Drosera experiments. Lists 12 acids tried so far.

Author:  Charles Robert Darwin
Addressee:  William Walmisley Baxter
Date:  8 Sept [1873]
Classmark:  DAR 261.11: 6 (EH 88206058)
Letter no:  DCP-LETT-9046

To J. S. Burdon Sanderson   9 September [1873]


Pleased JSBS has decided to work on Drosera; sends plants. Does not know whether thermo-electric pile could detect temperature change when leaves close.

CD’s experiment with very weak hydrochloric acid repeated with success: the plants digest albumen more quickly.

Author:  Charles Robert Darwin
Addressee:  John Scott Burdon Sanderson, baronet
Date:  9 Sept [1873]
Classmark:  University of British Columbia Library, Rare Books and Special Collections (Darwin - Burdon Sanderson letters RBSC-ARC-1731-1-14)
Letter no:  DCP-LETT-9047

To T. F. Cheeseman   9 September [1873]


Thanks TFC for his extremely interesting paper ["On the fertilisation of the New Zealand species of Pterostyles", Trans. & Proc. N. Z. Inst. 5 (1872): 352–7]. Has no doubt his explanation [of the fertilisation mechanism] is correct. The case is analogous to that of the Cypripedium though TFC’s case is much more curious.

Author:  Charles Robert Darwin
Addressee:  Thomas Frederick Cheeseman
Date:  9 Sept [1873]
Classmark:  Auckland War Memorial Museum Library Tāmaki Paenga Hira (T. F. Cheeseman Papers MS-58)
Letter no:  DCP-LETT-9048

To M. D. Conway   12 September [1873]


Thanks for strange debate, which CD returns. Principle of evolution has first-rate supporters in [Edward Sylvester?] Morse and Theodore Nicholas Gill.

Author:  Charles Robert Darwin
Addressee:  Moncure Daniel Conway
Date:  12 Sept [1873]
Classmark:  Archives of the New York Botanical Garden (Charles Finney Cox Collection)
Letter no:  DCP-LETT-9051

To J. D. Hooker   12 September [1873]



Thanks JDH and Thiselton-Dyer for useful information.

Is surprised Mimosa albida is not sensitive to water. Asks that they try again, or lend it to him.

Remembers a walk in Brazil in great bed of Mimosa.

After JDH left, CD was very bad, with much loss of memory and severe shocks continually passing through his brain.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  12 Sept [1873]
Classmark:  DAR 95: 274–6
Letter no:  DCP-LETT-9052

To J. S. Burdon Sanderson   13 September [1873]


Thanks JSBS for telegraphing his results, which seem very remarkable; feels he should now try Drosera.

Author:  Charles Robert Darwin
Addressee:  John Scott Burdon Sanderson, baronet
Date:  13 Sept [1873]
Classmark:  University of British Columbia Library, Rare Books and Special Collections (Darwin - Burdon Sanderson letters RBSC-ARC-1731-1-15)
Letter no:  DCP-LETT-9055

To J. S. Burdon Sanderson   14 September [1873]


Very pleased at JSBS’s discovery ["On the electrical phenomena which accompany the contractions of the leaf of Dionaea muscipula", Rep. BAAS 43 (1873): 133].

Asks for pure animal substances [proteins] for Drosera experiments. His other sources have been T. L. Brunton, Edward Frankland, W. A. Miller (now dead), and Hoffmann of Berlin [A. W. von Hofmann?].

Author:  Charles Robert Darwin
Addressee:  John Scott Burdon Sanderson, baronet
Date:  14 Sept [1873]
Classmark:  University of British Columbia Library, Rare Books and Special Collections (Darwin - Burdon Sanderson letters RBSC-ARC-1731-1-9)
Letter no:  DCP-LETT-9056

To E. S. Morse   16 September 1873


Thanks for ESM’s paper ["On the systematic position of the Brachiopoda", Proc. Boston Soc. Nat. Hist. 15 (1873): 315–72]. "What a wonderful change … to look at these ""shells"" as ""worms""."

Author:  Charles Robert Darwin
Addressee:  Edward Sylvester Morse
Date:  16 Sept 1873
Classmark:  Joseph R. Sakmyster, ADS Autographs (dealer) (no date)
Letter no:  DCP-LETT-9058

To J. D. Hooker   19 September [1873]



Obliged for information on Mimosa albida; if a vigorous plant behaves as JDH says, CD’s notions are all knocked on the head.

Anxious to read Tyndall’s answer to Tait [Nature 8 (1873): 399].

Drosera story too long for his strength. Essentially the leaves act just like stomach of an animal.

Burdon Sanderson will give some grand facts at BAAS about Dionaea.

Offers to help JDH with Nepenthes experiments. Finds experimental work always takes twice as much time as anticipated.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  19 Sept [1873]
Classmark:  DAR 95: 277–9
Letter no:  DCP-LETT-9059

To E. A. Darwin   20 September 1873


Consults about the wisdom of Frank’s becoming CD’s assistant rather than practising medicine.

Outlines his finances.

[Copy in EAD’s hand.]

Author:  Charles Robert Darwin
Addressee:  Erasmus Alvey Darwin
Date:  20 Sept 1873
Classmark:  DAR 105: B1–3
Letter no:  DCP-LETT-9060

To Edward Frankland   21 September [1873]


Although CD’s experiments with pepsin were unsuccessful, he observed that the glands [of Drosera] as far as acid is concerned act just as the stomach of a mammal. Further experiments detailed. The secretion must contain something analogous to pepsin. [See 9062.]

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  21 Sept [1873]
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9061A
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