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Cohn, F. J. in author 
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DCP-LETT-9810

From:
Ferdinand Julius Cohn
To:
Charles Robert Darwin
Date:
9 Jan 1875
Source of text:
DAR 161: 199
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.

Contributor:
Darwin Correspondence Project

DCP-LETT-10131

From:
Ferdinand Julius Cohn
To:
Charles Robert Darwin
Date:
21 Aug 1875
Source of text:
DAR 161: 200
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.

Contributor:
Darwin Correspondence Project

DCP-LETT-10137

From:
Ferdinand Julius Cohn
To:
Charles Robert Darwin
Date:
28 Aug 1875
Source of text:
DAR 86: B3–4
Summary:

Clarifies his thoughts on "aggregation" in Drosera.

Contributor:
Darwin Correspondence Project
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