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From Ernst Haeckel   9 February 1879

Summary

Sends birthday wishes.

Comments on progress of CD’s theory in Germany. Mentions opposition of Rudolf Virchow and his reply Freie Wissenschaft und freie Lehre [1878].

Describes research trip to Brittany and Normandy.

Research on Challenger Radiolaria.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  9 Feb 1879
Classmark:  DAR 166: 72
Letter no:  DCP-LETT-11865

From Ernst Haeckel   12 July 1879

Summary

Thanks CD for comments on Freie Wissenschaft und freie Lehre [1878].

Describes work on Medusae.

Describes work on Challenger Radiolaria and publication plans.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  12 July 1879
Classmark:  DAR 166: 73
Letter no:  DCP-LETT-12148

From Ernst Haeckel   30 August 1879

Summary

Accepts invitation to visit Down.

Describes travel plans in Scotland.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  30 Aug 1879
Classmark:  DAR 166: 75
Letter no:  DCP-LETT-12205

From Ernst Haeckel    3 September 1879

Summary

Arranges to visit Down.

Author:  Ernst Philipp August (Ernst) Haeckel
Addressee:  Charles Robert Darwin
Date:  3 Sept 1879
Classmark:  DAR 166: 74
Letter no:  DCP-LETT-12215
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