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From C. G. Ehrenberg   20 October 1873

Summary

Sends an essay ["Mikrogeologische Studien über das kleinste Leben der Meeres-Tiefgründe aller Zonen und dessen geologischen Einfluss", Abhandlungen der Preussischen Akademie der Wissenschaften zu Berlin (1873): 131-98.]

with expressions of admiration. CGE is confident their differences will not estrange them.

Remembers with gratitude the [Atlantic] dust that CD made available to him in 1844 [see 747].

Author:  Christian Gottfried Ehrenberg
Addressee:  Charles Robert Darwin
Date:  20 Oct 1873
Classmark:  DAR 163: 12
Letter no:  DCP-LETT-9103

To C. G. Ehrenberg   30 December 1873

Summary

Thanks CGE for gift of his latest work [Mikrogeologische Studien (1873)].

Author:  Charles Robert Darwin
Addressee:  Christian Gottfried Ehrenberg
Date:  30 Dec 1873
Classmark:  Berlin-Brandenburgische Akademie der Wissenschaften (Nachlass Ehrenburg Nr. 321)
Letter no:  DCP-LETT-9192

To C. G. Ehrenberg   29 October [1845]

Summary

Sends specimens. Asks for information about specimens from Rio Gallegos.

What does CGE mean by the term "Fluthgebiete"?

French translation gives impression that Ehrenberg attributes Pampas deposit to debacle.

Author:  Charles Robert Darwin
Addressee:  Christian Gottfried Ehrenberg
Date:  29 Oct [1845]
Classmark:  Museum für Naturkunde, Humboldt Universität, Berlin
Letter no:  DCP-LETT-923

From C. G. Ehrenberg   11 March 1846

Summary

Describes Infusoria in Rio Gallegos samples.

"Fluthgebiete" means estuary deposit.

Discusses dust samples from Malta. Asks for further samples.

Author:  Christian Gottfried Ehrenberg
Addressee:  Charles Robert Darwin
Date:  11 Mar 1846
Classmark:  DAR 39: 62–3
Letter no:  DCP-LETT-960

To C. G. Ehrenberg   25 March [1846]

Summary

Sends copy [of "Fine dust in the Atlantic Ocean", Collected papers 1: 199–202]. Attempting to obtain further samples for CGE.

Author:  Charles Robert Darwin
Addressee:  Christian Gottfried Ehrenberg
Date:  25 Mar [1846]
Classmark:  Museum für Naturkunde, Humboldt Universität, Berlin
Letter no:  DCP-LETT-965

To Christian Gottfried Ehrenberg   22 July [1866?]

Summary

Thanks CGE for two papers and for his assistance of many years ago.

Author:  Charles Robert Darwin
Addressee:  Christian Gottfried Ehrenberg
Date:  22 July [1866?]
Classmark:  Archiv der Berlin-Brandenburgischen Akademie der Wissenschaften, Nachlass C. G. Ehrenberg, Nr. 321
Letter no:  DCP-LETT-5163

To Christian Gottfried Ehrenberg   18 November [1869]

Summary

Thanks CGE for memoir on the Bacillariae of Mexico [Abh. K. Akad. Wiss. Berlin (Phys.) (1869): 1–66].

Author:  Charles Robert Darwin
Addressee:  Christian Gottfried Ehrenberg
Date:  18 Nov [1869]
Classmark:  Archiv der Berlin-Brandenburgische Akademie der Wissenschaften (ABBAW): (NL Ehrenberg, Nr. 321, Brief von Charles Darwin)
Letter no:  DCP-LETT-6996

To Christian Gottfried Ehrenberg   20 April [1844]

Summary

Sends samples likely to contain Infusoria and some that Hooker collected in Antarctic regions.

Author:  Charles Robert Darwin
Addressee:  Christian Gottfried Ehrenberg
Date:  20 Apr [1844]
Classmark:  Museum für Naturkunde, Humboldt Universität, Berlin
Letter no:  DCP-LETT-747

From C. G. Ehrenberg    15 June 1844

Summary

Thanks for earth samples. Discusses Infusoria in samples from Galapagos and Cape Verde Islands. Would like samples from other sites. Will send further results of investigations.

Author:  Christian Gottfried Ehrenberg
Addressee:  Charles Robert Darwin
Date:  15 June 1844
Classmark:  DAR 163: 10
Letter no:  DCP-LETT-758

To C. G. Ehrenberg   4 July [1844]

Summary

Astonished that dust sample contains Infusoria. Thinks dust is volcanic. Will write account of falling dust [see 775]. Offers further samples.

Author:  Charles Robert Darwin
Addressee:  Christian Gottfried Ehrenberg
Date:  4 July [1844]
Classmark:  Museum für Naturkunde, Humboldt Universität, Berlin
Letter no:  DCP-LETT-760

From C. G. Ehrenberg   11 July 1844

Summary

Thanks for shipments of earth samples. Sends copy of article describing Infusoria in samples ["Einige vorläufige Resultate … über das Verhalten des kleinsten Lebens in den Oceanen", Ber. k. Preuss. Akad. Wiss. Berlin (1844): 182–207]. Asks for more information and samples, especially from the soundings of Ross’s expedition.

Author:  Christian Gottfried Ehrenberg
Addressee:  Charles Robert Darwin
Date:  11 July 1844
Classmark:  DAR 163: 11
Letter no:  DCP-LETT-762

To C. G. Ehrenberg   5 September [1844]

Summary

Has at last received first letter CGE wrote.

More specimens being sent.

Sends his sketch of paper ["Fine dust in the Atlantic Ocean" (1846), Collected papers 1: 199–203].

D’Orbigny considers Pampas clay deposit result of debacle. CD cannot doubt it is slow, estuary deposit. Would be grateful for information on this point.

Author:  Charles Robert Darwin
Addressee:  Christian Gottfried Ehrenberg
Date:  5 Sept [1844]
Classmark:  Museum für Naturkunde, Humboldt Universität, Berlin
Letter no:  DCP-LETT-775

To C. G. Ehrenberg   23 January [1845]

Summary

Would like sketch returned [see 775].

Would be particularly thankful for result of CGE’s observations on earth of Pampas.

Asks that Ernst Dieffenbach return copperplate and woodcuts.

Author:  Charles Robert Darwin
Addressee:  Christian Gottfried Ehrenberg
Date:  23 Jan [1845]
Classmark:  Museum für Naturkunde, Humboldt Universität, Berlin
Letter no:  DCP-LETT-819

From C. G. Ehrenberg   13 March 1845

Summary

Regrets J. D. Hooker did not visit Berlin.

Describes legal difficulties of Ernst Dieffenbach.

Lists species of Infusoria found in dust samples. Discusses origin of Atlantic dust. Discusses Infusoria in cosmetic paint from Tierra del Fuego and Patagonian earth. Thanks CD for samples. Would like samples from sea-bed.

Author:  Christian Gottfried Ehrenberg
Addressee:  Charles Robert Darwin
Date:  13 Mar 1845
Classmark:  DAR 39: 59a–c
Letter no:  DCP-LETT-837

To C. G. Ehrenberg  23 March [1845]

Summary

Cannot doubt that Atlantic dust comes from Africa. Could Gulf Stream have brought South American organisms to African coast?

Has come to same conclusion as CGE on volcanic origin of Patagonian stone. Formation extends 550 miles.

Could CGE examine Pampas mud to see if Infusoria are freshwater or salt-water? Results would be important.

Author:  Charles Robert Darwin
Addressee:  Christian Gottfried Ehrenberg
Date:  23 Mar [1845]
Classmark:  Museum für Naturkunde, Humboldt Universität, Berlin
Letter no:  DCP-LETT-845

From C. G. Ehrenberg    8 April 1845

Summary

Discusses table of Atlantic dust samples. Thinks dust came from South America.

Discusses Patagonian tuff samples.

Answers CD’s query about material from Pampas. Believes deposit made in brackish water.

Criticises account of Atlantic dust in F. J. F. Meyen [Reise um die Erde (1834–5)].

Author:  Christian Gottfried Ehrenberg
Addressee:  Charles Robert Darwin
Date:  8 Apr 1845
Classmark:  DAR 39: 60–1b
Letter no:  DCP-LETT-853

To C. G. Ehrenberg   21 May [1845]

Summary

CGE’s account of Pampas mud confirms CD’s view of its origin. Will send Patagonian specimens. Discusses dust-carrying winds in the Atlantic.

Was not referring to F. J. F. Meyen’s voyage.

Corrects error concerning samples.

Author:  Charles Robert Darwin
Addressee:  Christian Gottfried Ehrenberg
Date:  21 May [1845]
Classmark:  Museum für Naturkunde, Humboldt Universität, Berlin
Letter no:  DCP-LETT-870
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1844 (5)
1845 (6)
1846 (2)
1866 (1)
1869 (1)
1873 (2)
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