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Agassiz, Alexander in correspondent 
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From:
Alexander Agassiz
To:
Charles Robert Darwin
Date:
22 Oct 1870
Source of text:
G. R. Agassiz ed. 1913, p. 113
Summary:

Asks whether he may see CD before leaving England.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Alexander Agassiz
Date:
[23 Oct 1870?]
Source of text:
DAR 143: 7
Summary:

Suggests time for AA to visit.

Contributor:
Darwin Correspondence Project
From:
Alexander Agassiz
To:
Charles Robert Darwin
Date:
[before 1 June 1871]
Source of text:
DAR 69: A43–6 DAR 89: 29–31
Summary:

Instances of sexual differences in viviparous fishes, suggested by reading chapters on sexual selection [in Descent] and by Mivart’s Genesis of species.

Notes on echinoderms.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Alexander Agassiz
Date:
1 June [1871]
Source of text:
DAR 143: 8
Summary:

Discusses homologies in various animal groups.

Comments on Mivart [Genesis of species].

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Alexander Agassiz
Date:
28 Aug [1871]
Source of text:
Sotheby’s, New York (dealers) (13 December 2018, lot 236)
Summary:

Thanks AA for a ‘splendid case of gradation of structure’.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Alexander Agassiz
Date:
10 Sept [1871 or 1873]
Source of text:
DAR 143: 9
Summary:

Discusses exchange of books.

Contributor:
Darwin Correspondence Project
From:
Alexander Agassiz
To:
Charles Robert Darwin
Date:
4 Mar 1872
Source of text:
G. R. Agassiz ed. 1913, p. 119
Summary:

Thanks for new [6th] edition of Origin.

Is working on Echini.

The more material he gets the less easy it is to diagnose a genus or species. Has little doubt that "classification is nothing but the most arbitrary convenient tool, depending upon the material at our command at a special time".

Contributor:
Darwin Correspondence Project
From:
Alexander Agassiz
To:
Charles Robert Darwin
Date:
9 Dec 1872
Source of text:
G. R. Agassiz ed. 1913, pp. 120–1
Summary:

Thanks for Expression.

Has lost a year’s work in the fire that has devastated Boston.

Contributor:
Darwin Correspondence Project
From:
Alexander Agassiz
To:
Charles Robert Darwin
Date:
16 Apr 1881
Source of text:
G. R. Agassiz ed. 1913 , pp. 281–2
Summary:

Is mapping coral distribution on the Tortugas reef. His observations on the Florida peninsula suggest that it was built up from the debris of animal remains and was not elevated.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Alexander Agassiz
Date:
5 May 1881
Source of text:
DAR 143: 11
Summary:

Responds to comments on geology of Florida.

Discusses coral reefs and paper by John Murray ["On the structure and origin of coral reefs and islands", Proc. R. Soc. Edinburgh 10 (1880): 505–18].

Comments on AA’s paper ["Paleontological and embryological development", Proc. Am. Assoc. Adv. Sci. 29 (1880): 389–414].

Contributor:
Darwin Correspondence Project
From:
Alexander Agassiz
To:
Charles Robert Darwin
Date:
19 May 1881
Source of text:
G. R. Agassiz ed. 1913 , pp. 284–6
Summary:

Discusses the structure and formation of the Florida peninsula. Part played by marine animals in building banks on which coral can thrive.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Alexander Agassiz
Date:
1 [June] 1881
Source of text:
DAR 143: 10
Summary:

Thanks AA for letter on coral reefs. "I used to think … that areas of elevation and of subsidence must – as a general rule be separated by a single great line of fissure, or rather of several".

Suggests that AA urge again his views on reappearance of old characters.

Contributor:
Darwin Correspondence Project