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To Ernst Haeckel   4 July [1867]

Summary

Congratulates EH on approaching marriage.

Sorry he will not visit in autumn.

Glad EH is re-examining Protoamoeba but puzzled to think what he can find.

Describes newspaper account of criticism by Agassiz of Generelle Morphologie.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  4 July [1867]
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1-52/15)
Letter no:  DCP-LETT-5578

From Ernst Haeckel   [before 6 February 1868]

Summary

Describes his lectures on CD’s theory.

Thanks CD for copy of Variation. Comments on book.

Describes work of two protégés in Jena: Nicolas von Miklucho[-Maclay] and Anton Dohrn.

His cousin, Wilhelm Bleek, is sending an article about the origin of language.

Asks to keep book a few months longer but will return it if CD needs it [Webb and Berthelot, Histoire naturelle des Îles Canaries, vol. 3, pt 1: Géographie botanique (1840)].

Describes research on Siphonophora.

Describes life in Jena. Mentions alpine accident during wedding trip.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  [before 6 Feb 1868]
Classmark:  DAR 166: 46
Letter no:  DCP-LETT-5840

To Ernst Haeckel   6 February [1868]

Summary

Delighted to hear of success of EH’s lectures.

Ernest Faivre [La variabilité des espèces (1868)] sees no reason to favour common descent of allied species.

Asks EH to pass German edition of Variation on to Gegenbaur.

Comments on work of Miklucho[-Maclay], Dohrn, and Bleek.

Has begun work on Descent.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  6 Feb [1868]
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/16)
Letter no:  DCP-LETT-5841

From Ernst Haeckel   23 March 1868

Summary

Has received English edition of Variation. First volume of German edition came three months ago. Comments on book.

Will send copy of recent lectures on human evolution [Entstehung des Menschengeschlechts (1868)]. Gegenbaur much interested in the subject.

Considers Selachius the ancestral form of the fish and hence of all higher vertebrates. Believes their swim-bladder became lung of amphibians.

Mentions cases of hybrid crosses between rabbits and hares producing fertile offspring.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  23 Mar 1868
Classmark:  DAR 166: 47
Letter no:  DCP-LETT-6040

To Ernst Haeckel   30 March [1868]

Summary

Now understands importance of swim-bladder in selachians. Always imagined animal like Lepidosiren was parent form of vertebrates.

Has been nearly a month in London, collecting facts on sexual selection from breeders and at Zoological Gardens.

Astonished at hybrid of rabbit and hare. Is it certain that work was done with hare?

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  30 Mar [1868]
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/17)
Letter no:  DCP-LETT-6070

From Ernst Haeckel   22 June 1868

Summary

Thanks CD for article by G. H. Lewes ["Mr Darwin’s hypotheses, pt 1", Fortn. Rev. n.s. 3 (1868): 353–73]. Comments on article.

Describes hybridisation experiment carried out on rabbits and hares by Dr Conrad.

Encloses description of Monera

and a phylogenetic table of vertebrates.

Mentions work on Medusae.

The controversy over CD in Germany.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  22 June 1868
Classmark:  DAR 166: 48
Letter no:  DCP-LETT-6255

To Ernst Haeckel   3 July 1868

Summary

Thanks for two small works.

Will read essay on man [Entstehung des Menschengeschlechts] with much interest.

Generelle Morphologie reviewed by G. Bentham ["Anniversary Address", Proc. Linn. Soc. Lond. (1867–8): lviii–c].

Extremely sceptical of hare–rabbit hybrid.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  3 July 1868
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1:1–52/18)
Letter no:  DCP-LETT-6265

From Ernst Haeckel   17 July 1868

Summary

Comments on CD’s health.

Has received gold medal from Dutch Academy of Science for Zur Entwicklungsgeschichte der Siphonophoren [1869].

His Entstehung des Menschengeschlechts [1868] has been sharply attacked by the clergy.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  17 July 1868
Classmark:  DAR 166: 49
Letter no:  DCP-LETT-6280

To Ernst Haeckel   7 November 1868

Summary

Thanks for [Natürliche] Schöpfungsgeschichte [1868]. "What an indomitable worker you are."

Agrees with EH’s Entstehung des Menschengeschlechts [1868].

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  7 Nov 1868
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/19)
Letter no:  DCP-LETT-6450

From Ernst Haeckel   9 November 1868

Summary

Thanks CD for comments [on Entstehung des Menschengeschlechts].

Comments on Goethe and Kant as early evolutionists.

Describes birth of his son. Mentions child’s "atavisms".

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  9 Nov 1868
Classmark:  DAR 166: 50
Letter no:  DCP-LETT-6452

To Ernst Haeckel   19 November 1868

Summary

Congratulates EH on birth of child.

Mentions projected translation of Generelle Morphologie.

Comments on EH’s last book [Natürliche Schöpfungsgeschichte]. Criticises EH’s statements on palaeontology.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  19 Nov 1868
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/20)
Letter no:  DCP-LETT-6466

From Ernst Haeckel   25 November [1868]

Summary

Comments on experience of being a father.

Discusses possible English edition of Generelle Morphologie. Mentions necessary revisions.

Thanks CD for comment on Natürliche Schöpfungsgeschichte.

Discusses problem of assigning specific times to origin of classes.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  25 Nov [1868]
Classmark:  DAR 166: 51
Letter no:  DCP-LETT-6474

To Ernst Haeckel   20 December 1868

Summary

Concerning death of August Schleicher.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  20 Dec 1868
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/21)
Letter no:  DCP-LETT-6509

From Ernst Haeckel   2 July 1869

Summary

Comments on 5th edition of the Origin [1869];

preparation of second edition of Natürliche Schöpfungsgeschichte [1870].

The reception of CD’s theory. Mentions support of Pieter Harting and Michael Sars.

EH’s research on calcareous sponges and plans to publish monograph on them.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  2 July 1869
Classmark:  DAR 166: 52
Letter no:  DCP-LETT-6812

To Ernst Haeckel   3 August [1869]

Summary

Suggests Englishmen who might provide sponge specimens.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  3 Aug [1869]
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/22)
Letter no:  DCP-LETT-6850

From Ernst Haeckel   29 September 1869

Summary

Thanks CD for assistance concerning sponge specimens. Mentions Englishmen who have sent specimens. J. S. Bowerbank has not answered requests.

Sends articles dealing with sponges and Medusae. Cites passages for CD to read. Suggests passages from Entwicklungsgeschichte der Siphonophoren [1869].

Describes meeting with Sars and his trip to Norway.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  29 Sept 1869
Classmark:  DAR 166: 53
Letter no:  DCP-LETT-6917

To Ernst Haeckel   3 October [1869]

Summary

Mentions views of Sars on species.

EH’s work on Siphonophora.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  3 Oct [1869]
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/23)
Letter no:  DCP-LETT-6924

To Ernst Haeckel   23 June [1870]

Summary

Comments on new edition of EH’s book [Natürliche Schöpfungsgeschichte, 2d ed. (1870)].

Mentions his own book [Descent].

Visit by Kölliker.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  23 June [1870]
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/24)
Letter no:  DCP-LETT-7241

From Ernst Haeckel   6 July 1870

Summary

Discusses applicability of evolutionary theory to the question of human origins.

Describes revisions in 2d edition of Natürliche Schöpfungsgeschichte.

His research on calcareous sponges.

Mentions evolutionary content in Gegenbaur’s Vergleichende Anatomie [2d ed. (1870)].

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  6 July 1870
Classmark:  DAR 166: 54
Letter no:  DCP-LETT-7268

From Ernst Haeckel   24 February 1871

Summary

Received copy of Descent.

Discusses CD’s comments on EH’s work.

Speculates about reception by press and scientists.

Remarks on sexual selection;

on human relationship to catarrhine apes.

Has rejected offer of chair at Vienna.

Compares Jena to Down.

Describes growth of his salary.

Mentions birth of Emma Haeckel.

A. M. Norman’s collection of calcareous sponges is very valuable.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  24 Feb 1871
Classmark:  DAR 166: 55
Letter no:  DCP-LETT-7510
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