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Claus, C. F. in addressee 
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From:
Charles Robert Darwin
To:
Carl Friedrich Claus
Date:
28 Jan 1869
Source of text:
Staatsbibliothek zu Berlin – Preußischer Kulturbesitz (Slg. Darmstaedter Lc 1859: Darwin, Charles, Bl. 205–207)
Summary:

Thanks CC for two memoirs [see 6575. The other was possibly "Die Cypris-ähnliche Larve der Cirripedien", Schr. Ges. Beförd Naturw. Marburg (1869)].

Haeckel is too enthusiastic and too bold in drawing conclusions.

CD sees no reason to add to what he says on isolation, in new edition of Origin.

Lists specimens he has available for CC’s intended study of metamorphoses of Lepas.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Carl Friedrich Claus
Date:
31 Mar 1869
Source of text:
Staatsbibliothek zu Berlin – Preußischer Kulturbesitz (Slg. Darmstaedter Lc 1859: Darwin, Charles, Bl. 208–209)
Summary:

Williams and Norgate inform CD that they dispatched the small parcel to Leipzig on 23 February. CD fears it may not be worth the trouble to CC.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Carl Friedrich Claus
Date:
2 May 1876
Source of text:
Wiener Neue Freie Presse , 22 April 1882, p. 2
Summary:

Thanks CC for dedication [of his Grundlage des Crustaceen-Systems (1876)]. Congratulates CC on completion of work.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Carl Friedrich Claus
Date:
9 July 1876
Source of text:
Christie’s, London (dealers) (1 December 2016)
Summary:

Thanks for copy of Claus’s book, Untersuchungen zur Erforschung der genealogischen Grundlage des Crustaceen-Systems: ein Beitrag zur Descendenzlehre (Studies on the investigation of the genealogical foundation of the Crustacea: a contribution to the theory of descent; Claus 1876).

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Carl Friedrich Claus
Date:
9 Mar 1877
Source of text:
Staatsbibliothek zu Berlin – Preußischer Kulturbesitz (Slg. Darmstaedter Lc 1859: Darwin, Charles, Bl. 210–211)
Summary:

Warm thanks for CC’s letter. CD needed no word from CC to be convinced of his high opinion.

Contributor:
Darwin Correspondence Project