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To Ernst Haeckel   3 March [1864]

Summary

Has received EH’s Die Radiolarien. Drawings admirably executed. Had no idea such low animals could develop such beautiful structures.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  3 Mar [1864]
Classmark:  Ernst-Haeckel-Haus (Bestand A–Abt. 1: 1–52/2)
Letter no:  DCP-LETT-4419

To Ernst Haeckel   9 March 1864

Summary

Thanks for paper ["Über die Entwicklungstheorie Darwins", Amtl. Ber. Versamml. Dtsch. Naturforsch. Aerzte 38 (1863): 17–30]. Delighted EH confirms his views. Many in England afraid to express views openly.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  9 Mar 1864
Classmark:  Ernst-Haeckel-Haus (Bestand A–Abt. 1: 1–52/3)
Letter no:  DCP-LETT-4422

To Ernst Haeckel   19 July [1864]

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Summary

Thanks for praise [of Origin].

Comments on EH’s Die Radiolarien.

Grieved EH has suffered calamity [death of Anna Sethe Haeckel].

CD recovering from long illness.

Doing easy botanical work.

Mentions variability.

Discusses reception of CD’s views in Germany.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  19 July [1864]
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1-52/4)
Letter no:  DCP-LETT-4569

To Ernst Haeckel   [after 10] August – 8 October [1864]

Summary

Can understand EH’s feelings on death of his wife.

CD was impressed by manner in which species in South America are replaced by closely allied ones, by affinity of species inhabiting islands near S. America, and by relation of living Edentata and Rodentia to extinct species. When he read Malthus On population, the idea of natural selection flashed on him.

Agrees with EH’s remarks on Kölliker ["Darwin’sche Schöpfungstheorie", Z. Wiss. Zool. 14 (1864): 174–86].

Asks EH to thank Carl Gegenbaur [for Vergleichende Anatomie der Wirbelthiere (1864)].

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  [after 10] Aug – 8 Oct [1864]
Classmark:  Ernst-Haeckel-Haus (Bestand A–Abt. 1: 1–52/5)
Letter no:  DCP-LETT-4631

To Ernst Haeckel   21 November [1864]

Summary

Sends Living Cirripedia [vol. 2].

Has employed translator for Fritz Müller’s book [Für Darwin (1864)].

Thanks for paper and speech.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  21 Nov [1864]
Classmark:  Ernst-Haeckel-Haus (Bestand A–Abt. 1: 1–52/6)
Letter no:  DCP-LETT-4676

From Ernst Haeckel   2 January 1864

Summary

Returns letter mailed by mistake [see 4361].

Hopes CD will accept gift of his Radiolarien [Die Radiolarien, 2 vols. (1862)].

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  2 Jan 1864
Classmark:  DAR 166: 36
Letter no:  DCP-LETT-4377

From Ernst Haeckel   9 [July 1864]

Summary

No book has made such a powerful impression on EH as the Origin. Most older German scholars opposed to it, but number of supporters growing among the young. Fortunately strength of religious dogmas now small among educated Germans. Situation in Jena especially favourable. Defended CD’s theory last year at Congress of German Scientists in Stettin.

Intends special study of jellyfish.

Plans general work on natural history.

Hard fate [death of Anna Sethe Haeckel] has made EH indifferent to criticism.

Colleagues August Schleicher and Carl Gegenbaur also convinced by CD’s theory.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  9 [July 1864]
Classmark:  DAR 166: 35
Letter no:  DCP-LETT-4555

From Ernst Haeckel   10 August 1864

Summary

Sends photographs of himself and his late wife [Anna Sethe]. Describes death of his wife.

Plans trip to the Alps.

Thanks CD for biographical information about himself.

Mentions Goethe as early evolutionist.

Cites Kant as early supporter of epigenesis.

Mentions criticism of CD’s theory by R. A. von Kölliker ["Über die Darwin’sche Schöpfungstheorie", Z. Wiss. Zool. 14 (1864): 174–86].

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  10 Aug 1864
Classmark:  DAR 166: 38
Letter no:  DCP-LETT-4586

From Ernst Haeckel   26 October 1864

Summary

Thanks CD for notes concerning the development of his ideas about the origin of species. Says August Schleicher and Carl Gegenbaur also interested.

Names new supporters of CD’s theory, including Max Schultze, Rudolf Leuckart, and Alexander Braun. Zoologists have been more interested than botanists.

He is writing a general work on the relationships among animals [Generelle Morphologie der Organismen (1866)].

Comments on Fritz Müller’s Für Darwin [1864].

Gegenbaur is revising his Grundzüge der vergleichenden Anatomie [2d ed. (1870)] to accord with evolution.

Thanks CD for copy of book on balanids [Living Cirripedia, vol. 2].

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  26 Oct 1864
Classmark:  DAR 166: 39
Letter no:  DCP-LETT-4646
Document type
letter (9)
Addressee
Correspondent
Darwin, C. R.disabled_by_default
Haeckel, Ernstdisabled_by_default
Date
1864disabled_by_default
01 (1)
03 (2)
07 (2)
08 (2)
10 (1)
11 (1)