Search: Haeckel, Ernst in addressee 
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From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
3 Aug [1869]
Source of text:
Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/22)
Summary:

Suggests Englishmen who might provide sponge specimens.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
3 Oct [1869]
Source of text:
Ernst-Haeckel-Haus (Bestand A-Abt. 1: 1–52/23)
Summary:

Mentions views of Sars on species.

EH’s work on Siphonophora.

Contributor:
Darwin Correspondence Project