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Agassiz, Alexander in author 
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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:
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:
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