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Haeckel, Ernst in correspondent 
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From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
23 June [1870]
Source of text:
Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/24)
Summary:

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

Mentions his own book [Descent].

Visit by Kölliker.

Contributor:
Darwin Correspondence Project
From:
Ernst Philipp August (Ernst) Haeckel
To:
Charles Robert Darwin
Date:
6 July 1870
Source of text:
DAR 166: 54
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)].

Contributor:
Darwin Correspondence Project
From:
Ernst Philipp August (Ernst) Haeckel
To:
Charles Robert Darwin
Date:
24 Feb 1871
Source of text:
DAR 166: 55
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.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
3 Mar 1871
Source of text:
Ernst-Haeckel-Haus (Bestand A-Abt. 1-52/25 [9878]
Summary:

Comments on Descent.

EH’s refusal of position at Vienna.

Contributor:
Darwin Correspondence Project
From:
Ernst Philipp August (Ernst) Haeckel
To:
Charles Robert Darwin
Date:
21 Dec 1871
Source of text:
DAR 166: 56
Summary:

Comments on Die Kalkschwämme [1872].

A Franciscan prior, Padre Buona-Grazia, agrees with human descent.

His trip to Dalmatia.

German reception of Descent.

Mentions current work.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
27 Dec 1871
Source of text:
Ernst-Haeckel-Haus (Bestand A Abt. 1–52/26)
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.

Contributor:
Darwin Correspondence Project
From:
Ernst Philipp August (Ernst) Haeckel
To:
Charles Robert Darwin
Date:
1 Mar 1872
Source of text:
DAR 166: 57
Summary:

Thanks CD for Origin, 6th ed.

Has declined chair at Strasbourg.

Describes research on calcareous sponges.

Criticises Pangenesis.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
2 Sept 1872
Source of text:
Ernst-Haeckel-Haus (Bestand A-Abt. 1:1-52/27)
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)].

Contributor:
Darwin Correspondence Project
From:
Ernst Philipp August (Ernst) Haeckel
To:
Charles Robert Darwin
Date:
12 Oct 1872
Source of text:
DAR 166: 58
Summary:

Much experiment and observation needed before spontaneous generation will be empirically advanced, but philosophically the matter is clear.

Thinks Ludwig Rütimeyer has attacked EH to satisfy pious opinion in Basel.

Will soon be finished with his monograph Die Kalkschwämme [1872].

Contributor:
Darwin Correspondence Project
From:
Ernst Philipp August (Ernst) Haeckel
To:
Charles Robert Darwin
Date:
10 Dec 1872
Source of text:
DAR 166: 34, 59
Summary:

Thanks CD for Expression.

Describes work on Die Kalkschwämme and its principal conclusions.

The application of biogenetic law.

Notes variability among calcareous sponges.

Gastrula-like "Gastraea" as ancestor of multicellular animals.

Posits homology between Hydra, Olynthus of calcareous sponges, and initial germ layers of higher animals.

Comments on Lubbock’s Prehistoric times [1865]

and on David Strauss’s Der alte und der neue Glaube [1872].

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
20 Dec 1872
Source of text:
Ernst-Haeckel-Haus (Bestand A-Abt. 1:1-52/28)
Summary:

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

Thinks EH is working much too hard.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
20 Jan 1873
Source of text:
Ernst-Haeckel-Haus (Bestand A-Abt. 1: 52/29)
Summary:

On EH’s Die Kalkschwämme [1872].

Contributor:
Darwin Correspondence Project
From:
Ernst Philipp August (Ernst) Haeckel
To:
Charles Robert Darwin
Date:
23 Feb 1873
Source of text:
DAR 166: 60
Summary:

Thanks CD for comments on Die Kalkschwämme.

Plans trip to Greece, Asia Minor, and Egypt.

Discusses work of a Polish translator, Ludwik Masłowski.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
25 Sept 1873
Source of text:
Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1-52/30 [9883])
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].

Contributor:
Darwin Correspondence Project
From:
Ernst Philipp August (Ernst) Haeckel
To:
Charles Robert Darwin
Date:
8 Oct 1873
Source of text:
DAR 166: 61
Summary:

On CD’s paper ["Complemental males of certain cirripedes", Collected papers 2: 177–82].

Comments on paper by W. H. Dallinger and J. J. Drysdale ["Life history of a Cercomonad", Mon. Microsc. J. 10 (1873): 53–8].

Discusses origin of life, the Gastraea theory and concept that primary germ layers are homologous in all animals. Notes similar views of E. Ray Lankester ["On the primitive cell-layers of the embryo", Ann. & Mag. Nat. Hist. 4th ser. 11 (1873): 321–38].

Reception of Darwinism in Germany.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
20 Sept 1874
Source of text:
Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/31)
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.

Contributor:
Darwin Correspondence Project
From:
Ernst Philipp August (Ernst) Haeckel
To:
Charles Robert Darwin
Date:
26 Oct 1874
Source of text:
DAR 166: 62
Summary:

Thanks CD for Descent, 2d ed.

Comments on German edition of CD’s collected works.

Sales of his Anthropogenie [1874] in various countries.

Anticlericalism and progress of Darwinism in Germany.

Contributor:
Darwin Correspondence Project
From:
Ernst Philipp August (Ernst) Haeckel
To:
Charles Robert Darwin
Date:
20 Dec 1874
Source of text:
DAR 166: 63
Summary:

Discusses his Anthropogenie [1874]. Remarks on the tables.

Has CD received Friedrich von Hellwald’s Culturgeschichte [1875]?

Plans research trip to the Mediterranean.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
26 Dec 1874
Source of text:
Ernst-Haeckel-Haus (Bestand A–Abt. 1: 1–52/32)
Summary:

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

Mentions recent work of Huxley and other scientists.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
11 Jan [1875]
Source of text:
Ernst-Haeckel-Haus (Bestand A-Abt. 1:1-52/ 33 [9886])
Summary:

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

Contributor:
Darwin Correspondence Project