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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

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

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

To F. J. Cohn   1 January 1875

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Summary

Asks whether he might copy two of FJC’s drawings of Aldrovanda. He would like to have a proof of the plate for two woodcuts to be used in his forthcoming book [Insectivorous plants].

Author:  Charles Robert Darwin
Addressee:  Ferdinand Julius Cohn
Date:  1 Jan 1875
Classmark:  DAR 185: 97
Letter no:  DCP-LETT-9795A

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   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
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