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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

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

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

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

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

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

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

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

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

To Ernst Haeckel   3 March 1871

Summary

Comments on Descent.

EH’s refusal of position at Vienna.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  3 Mar 1871
Classmark:  Ernst-Haeckel-Haus, Friedrich-Schiller-Universität, Jena
Letter no:  DCP-LETT-7534

To Ernst Haeckel   27 December 1871

Summary

Refers to priest who believes in "our ape-like progenitors".

EH’s work on sponges.

Pangenesis.

Describes new edition of Origin [6th]

and his work on plant crossing.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  27 Dec 1871
Classmark:  Ernst-Haeckel-Haus, Friedrich-Schiller-Universität, Jena (Bestand A Abt. 1–52/26)
Letter no:  DCP-LETT-8121

To Ernst Haeckel   2 September 1872

Summary

Comments on EH’s criticism of authors in third edition of Natürliche Schöpfungsgeschichte [1872].

Discusses book by H. C. Bastian [The beginnings of life (1872)].

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  2 Sept 1872
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1:1-52/27)
Letter no:  DCP-LETT-8506

To Ernst Haeckel   20 December 1872

Summary

Comments on EH’s forthcoming [Die Kalkschwämme (1872)].

Thinks EH is working much too hard.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  20 Dec 1872
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1:1-52/28)
Letter no:  DCP-LETT-8688

To Ernst Haeckel   20 January 1873

Summary

On EH’s Die Kalkschwämme [1872].

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  20 Jan 1873
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1: 52/29)
Letter no:  DCP-LETT-8743

To Ernst Haeckel   25 September 1873

Summary

Comments on EH’s Natürliche Schöpfungsgeschichte [4th ed.].

Has written paper on rudimentary structures ["Complemental males of certain cirripedes", (1873) Collected papers 2: 177–82].

Edward Morse thinks brachiopods should be classed with annelids ["The systematic position of the Brachiopoda", Proc. Boston Soc. Nat. Hist. 15 (1873): 315–73].

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  25 Sept 1873
Classmark:  Ernst-Haeckel-Haus, Friedrich-Schiller-Universität, Jena (Bestand A-Abt. 1: 1-52/30)
Letter no:  DCP-LETT-9068

To Ernst Haeckel   20 September 1874

Summary

Thanks for 5th edition of his book [Natürliche] Schöpfungsgeschichte.

CD continues with his experiments on the digestive power of plants, which is much like that of mammals.

Is also preparing a revised edition of Descent.

Would welcome hearing more of his ideas about Pangenesis.

Postscript about Anthropogenie, which has just arrived. EH’s astonishing productivity.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  20 Sept 1874
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/31)
Letter no:  DCP-LETT-9647A

To Ernst Haeckel   26 December 1874

Summary

Comments on review of EH’s Anthropogenie [1874].

Mentions recent work of Huxley and other scientists.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  26 Dec 1874
Classmark:  Ernst-Haeckel-Haus (Bestand A–Abt. 1: 1–52/32)
Letter no:  DCP-LETT-9781

To Ernst Haeckel   11 January [1875]

Summary

Thanks for F. v. Hellwald [Culturgeschichte (1875)].

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  11 Jan [1875]
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1:1-52/ 33 [9886])
Letter no:  DCP-LETT-9811

To Ernst Haeckel   13 November 1875

Summary

Mentions receipt of EH’s History of creation [1876].

Describes his own work on cross- and self-fertilised flowers. Subject bears on the very principle of life.

Author:  Charles Robert Darwin
Addressee:  Ernst Philipp August (Ernst) Haeckel
Date:  13 Nov 1875
Classmark:  Ernst-Haeckel-Haus (Bestand A-Abt. 1:1-52/34 [9887])
Letter no:  DCP-LETT-10257
Document type
letter (97)
Author
Addressee
Correspondent
Darwin, C. R.[X]
Haeckel, Ernst[X]
Date
1863 (1)
1864 (9)
1865 (2)
1866 (7)
1867 (6)
1868 (12)
1869 (4)
1870 (2)
1871 (4)
1872 (5)
1873 (4)
1874 (4)
1875 (5)
1876 (10)
1877 (2)
1878 (2)
1879 (9)
1880 (3)
1881 (6)
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