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From F. J. Cohn   9 January 1875


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

From F. J. Cohn   21 August 1875


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



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
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letter (3)
Darwin, C. R.disabled_by_default