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
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
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 |
letter | (10) |
Cohn, F. J. | (10) |