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To F. J. Cohn   [30 June 1875]

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Summary

CD’s publisher is sending FJC an early copy of Insectivorous plants, in which he hopes that FJC’s admirable papers are acknowledged with the respect that they deserve.

Author:  Charles Robert Darwin
Addressee:  Ferdinand Julius Cohn
Date:  [30 June 1875]
Classmark:  DAR 185: 98
Letter no:  DCP-LETT-10037A

From F. J. Cohn   21 August 1875

Summary

Acknowledges presentation copy of Insectivorous plants.

Studying Drosera on vacation in Bohemia. Thinks CD has erred in considering "aggregation" to have occurred in the protoplasm. Suggests it is result of exosmosis of vacuole.

Author:  Ferdinand Julius Cohn
Addressee:  Charles Robert Darwin
Date:  21 Aug 1875
Classmark:  DAR 161: 200
Letter no:  DCP-LETT-10131

To F. J. Cohn   24 August 1875

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Summary

Responds to FJC’s criticism regarding "aggregation" as it occurs in protoplasm [see 10131].

Author:  Charles Robert Darwin
Addressee:  Ferdinand Julius Cohn
Date:  24 Aug 1875
Classmark:  DAR 185: 99
Letter no:  DCP-LETT-10134A

From F. J. Cohn   28 August 1875

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Summary

Clarifies his thoughts on "aggregation" in Drosera.

Author:  Ferdinand Julius Cohn
Addressee:  Charles Robert Darwin
Date:  28 Aug 1875
Classmark:  DAR 86: B3–4
Letter no:  DCP-LETT-10137

To F. J. Cohn   2 September 1875

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Summary

Further discussion of the process of aggregation in response to [10137].

Author:  Charles Robert Darwin
Addressee:  Ferdinand Julius Cohn
Date:  2 Sept 1875
Classmark:  DAR 185: 100
Letter no:  DCP-LETT-10150A

From F. J. Cohn   28 March 1876

Summary

Has had doctoral student [Alexander Fraustadt] working on the physiology and chemistry (i.e., chlorophyll and starch distribution) and comparative anatomy of Dionaea.

Author:  Ferdinand Julius Cohn
Addressee:  Charles Robert Darwin
Date:  28 Mar 1876
Classmark:  DAR 161: 201
Letter no:  DCP-LETT-10435

To F. J. Cohn   31 March [1876]

Summary

Thanks FJC for paper by Alexander Fraustadt ["Vegetative Organe von Dionaea", Ell. Beitr. Biol. Pfl. 2 (1877): 27–64].

Mentions paper by A. W. Bennett ["Glands of carnivorous plants", Mon. Microsc. J. 15 (1876): 1–5].

Author:  Charles Robert Darwin
Addressee:  Ferdinand Julius Cohn
Date:  31 Mar [1876]
Classmark:  Stuart Opotowsky (private collection)
Letter no:  DCP-LETT-10436

To F. J. Cohn   26 September [1876]

Summary

Invites him to visit Down.

Author:  Charles Robert Darwin
Addressee:  Ferdinand Julius Cohn
Date:  26 Sept [1876]
Classmark:  DAR 143: 265
Letter no:  DCP-LETT-10618

From F. J. Cohn   31 December 1876

Summary

Acknowledges presentation copy of Cross and self-fertilisation.

Thanks for visit to Down.

Praise for CD’s theories.

Author:  Ferdinand Julius Cohn
Addressee:  Charles Robert Darwin
Date:  31 Dec 1876
Classmark:  DAR 161: 202
Letter no:  DCP-LETT-10741

To F. J. Cohn   26 July 1877

Summary

Comments on paper by Francis Darwin ["Glandular hairs of the common teasel", Q. J. Microsc. Sci. 17 (1877): 169–74, 245–72].

Author:  Charles Robert Darwin
Addressee:  Ferdinand Julius Cohn
Date:  26 July 1877
Classmark:  DAR 143: 266
Letter no:  DCP-LETT-11073

From F. J. Cohn   5 August 1877

Summary

Praises unbroken series of CD’s and Francis [Darwin]’s botanical works.

Confirms FD’s Dipsacus observations. Problem of interpreting microscopic filaments as protoplasm or as inorganic and osmotic artifacts.

Author:  Ferdinand Julius Cohn
Addressee:  Charles Robert Darwin
Date:  5 Aug 1877
Classmark:  DAR 161: 203
Letter no:  DCP-LETT-11093

To F. J. Cohn   8 August 1877

Summary

Asks permission to publish comments by FJC regarding paper by Francis Darwin [see 11073].

Author:  Charles Robert Darwin
Addressee:  Ferdinand Julius Cohn
Date:  8 Aug 1877
Classmark:  [Michael Silverman (dealer) (2003); DAR 143: 267] ORIGINAL NOW Cornell University Library, Division of Rare and Manuscript Collections (Gail and Stephen Rudin autograph collection, #6875. Box 2, folder 22)
Letter no:  DCP-LETT-11095

From F. J. Cohn   [10?] August 1877

Summary

Accepts CD’s offer to publish his letter, confirming Francis Darwin’s observations [see Collected papers 2: 205–7].

H. Hoffmann’s observations on Amanita contractile filaments must be repeated.

Microscopic examination of secretory gland filaments in Dipsacus leafcups. FD’s pseudopod theory of Dipsacus.

Author:  Ferdinand Julius Cohn
Addressee:  Charles Robert Darwin
Date:  [10?] Aug 1877
Classmark:  DAR 161: 204
Letter no:  DCP-LETT-11101

From F. J. Cohn   31 December 1877

Summary

Sends details of H. H. R. Koch’s work on bacteria, including first photographs.

J. S. Burdon Sanderson’s and Koch’s collaboration on systemic fever.

Thinks movement of Francis Darwin’s Dipsacus filaments is an artifact.

Author:  Ferdinand Julius Cohn
Addressee:  Charles Robert Darwin
Date:  31 Dec 1877
Classmark:  DAR 161: 205
Letter no:  DCP-LETT-11298

To F. J. Cohn   3 January 1878

Summary

Comments on discovery of micro-organisms in disease.

Describes experiments carried out by Francis Darwin on filaments of Dipsacus.

Author:  Charles Robert Darwin
Addressee:  Ferdinand Julius Cohn
Date:  3 Jan 1878
Classmark:  Joseph R. Sakmyster, ADS Autographs (dealer) (no date)
Letter no:  DCP-LETT-11310

To F. J. Cohn   5 June 1878

Summary

Comments on achenia of Pumilio argyrolepis.

Author:  Charles Robert Darwin
Addressee:  Ferdinand Julius Cohn
Date:  5 June 1878
Classmark:  DAR 249: 73
Letter no:  DCP-LETT-11542

From F. J. Cohn| 26 December 1880

Summary

Response to Movement in plants. Setting out to confirm CD’s experiments. Believes plant cell motion, like that of animals, depends on protoplasm more than water.

Author:  Ferdinand Julius Cohn
Addressee:  Charles Robert Darwin
Date:  26 Dec 1880
Classmark:  DAR 161: 206
Letter no:  DCP-LETT-12940

To F. J. Cohn   11 January 1882

Summary

Thanks FJC for presentation copy [of Die Pflanze (1882)].

Author:  Charles Robert Darwin
Addressee:  Ferdinand Julius Cohn
Date:  11 Jan 1882
Classmark:  DAR 143: 270
Letter no:  DCP-LETT-13610

From F. J. Cohn   4 October 1874

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Summary

An account of his observations on Aldrovanda and Utricularia.

Sends CD his memoir on Aldrovanda [Beitr. Biol. Pflanz. 1 (1875) Heft 3: 71–92] in advance of publication [see Insectivorous plants, pp. 321 et seq., 395–6].

Author:  Ferdinand Julius Cohn
Addressee:  Charles Robert Darwin
Date:  4 Oct 1874
Classmark:  DAR 58.1: 95–6
Letter no:  DCP-LETT-9667

To F. J. Cohn   12 October 1874

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CD responds [to 9667] with description of his own effort to study Aldrovanda and his observations on the structure of Dionaea.

His admiration for FJC’s earlier studies of the Venus’s fly-trap.

He urges FJC to proceed promptly with publication of his memoir on Aldrovanda [Beiträge zur Biologie der Pflanzen 1, Heft 3 (1875): 71–92].

Author:  Charles Robert Darwin
Addressee:  Ferdinand Julius Cohn
Date:  12 Oct 1874
Classmark:  DAR 185: 107
Letter no:  DCP-LETT-9677A
Document type
letter (22)
Author
Addressee
Correspondent
Date
1874 (2)
1875 (7)
1876 (4)
1877 (5)
1878 (2)
1880 (1)
1882 (1)
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