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Cohn, F. J. in correspondent 
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From:
Ferdinand Julius Cohn
To:
Charles Robert Darwin
Date:
4 Oct 1874
Source of text:
DAR 58.1: 95–6
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].

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Ferdinand Julius Cohn
Date:
12 Oct 1874
Source of text:
DAR 185: 107
Summary:

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].

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Ferdinand Julius Cohn
Date:
1 Jan 1875
Source of text:
DAR 185: 97
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].

Contributor:
Darwin Correspondence Project
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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
From:
Charles Robert Darwin
To:
Ferdinand Julius Cohn
Date:
[30 June 1875]
Source of text:
DAR 185: 98
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.

Contributor:
Darwin Correspondence Project
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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
From:
Charles Robert Darwin
To:
Ferdinand Julius Cohn
Date:
24 Aug 1875
Source of text:
DAR 185: 99
Summary:

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

Contributor:
Darwin Correspondence Project
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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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From:
Charles Robert Darwin
To:
Ferdinand Julius Cohn
Date:
2 Sept 1875
Source of text:
DAR 185: 100
Summary:

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

Contributor:
Darwin Correspondence Project
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From:
Ferdinand Julius Cohn
To:
Charles Robert Darwin
Date:
28 Mar 1876
Source of text:
DAR 161: 201
Summary:

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

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ferdinand Julius Cohn
Date:
31 Mar [1876]
Source of text:
Stuart Opotowsky (private collection)
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].

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ferdinand Julius Cohn
Date:
26 Sept [1876]
Source of text:
DAR 143: 265
Summary:

Invites him to visit Down.

Contributor:
Darwin Correspondence Project
From:
Ferdinand Julius Cohn
To:
Charles Robert Darwin
Date:
31 Dec 1876
Source of text:
DAR 161: 202
Summary:

Acknowledges presentation copy of Cross and self-fertilisation.

Thanks for visit to Down.

Praise for CD’s theories.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ferdinand Julius Cohn
Date:
26 July 1877
Source of text:
DAR 143: 266
Summary:

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

Contributor:
Darwin Correspondence Project
From:
Ferdinand Julius Cohn
To:
Charles Robert Darwin
Date:
5 Aug 1877
Source of text:
DAR 161: 203
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.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ferdinand Julius Cohn
Date:
8 Aug 1877
Source of text:
Michael Silverman (dealer) (2003); DAR 143: 267
Summary:

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

Contributor:
Darwin Correspondence Project
From:
Ferdinand Julius Cohn
To:
Charles Robert Darwin
Date:
[10?] Aug 1877
Source of text:
DAR 161: 204
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.

Contributor:
Darwin Correspondence Project
From:
Ferdinand Julius Cohn
To:
Charles Robert Darwin
Date:
31 Dec 1877
Source of text:
DAR 161: 205
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.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ferdinand Julius Cohn
Date:
3 Jan 1878
Source of text:
Joseph R. Sakmyster, ADS Autographs (dealer) (no date)
Summary:

Comments on discovery of micro-organisms in disease.

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

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ferdinand Julius Cohn
Date:
5 June 1878
Source of text:
DAR 249: 73
Summary:

Comments on achenia of Pumilio argyrolepis.

Contributor:
Darwin Correspondence Project