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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

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

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

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

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

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

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

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

From F. J. Cohn   9 January 1875

Summary

Thanks CD for his letter of 1 Jan 1875. Will send a paper on the genus Volvox ["Die Entwicklungsgeschichte der Gattung Volvox", Cohn Beitr. Biol. Pflanz. 1 (1875) Heft 3: 99–115].

Informs CD of his discoveries of the "house"-building capacity of Difflugia, one of the lowest forms of organism.

Sends CD his writing on Aldrovanda and Utricularia, which he is welcome to use in his forthcoming book [Insectivorous plants].

Has observed a Dionaea fertilised without insect aid.

Author:  Ferdinand Julius Cohn
Addressee:  Charles Robert Darwin
Date:  9 Jan 1875
Classmark:  DAR 161: 199
Letter no:  DCP-LETT-9810
Document type
letter (10)
Author
Addressee
Darwin, C. R.disabled_by_default
Correspondent
Date
1874 (1)
1875 (3)
1876 (2)
1877 (3)
1880 (1)