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DCP-LETT-7723

From:
Charles Robert Darwin
To:
Friedrich Theodor Köppen (Fedor Petrovich Keppen)
Date:
28 Apr [1871]
Source of text:
Archive of the Russian Academy of Sciences, St Petersburg branch: SPBB ARAS (Fond 92. Register 1. Folder 112. P. 1, 1 r)
Summary:

Thanks for FTK’s locust paper ["Die geographische Verbreitung der Wanderheuschrecke", Petermann’s Geogr. Mittheil. (1871)].

Contributor:
Darwin Correspondence Project

DCP-LETT-8916

From:
Charles Robert Darwin
To:
Vladimir Onufrievich Kovalevsky (Владимир Онуфриевич Ковалевский)
Date:
21 May 1873
Source of text:
Archive of the Russian Academy of Sciences, St Petersburg branch: SPBB ARAS (Fond 300. Register 1a. Folder 4. P. 1-2 r)
Summary:

VOK’s paper ["Osteology of Hyopotamidae", Proc. R. Soc. Lond. 21 (1872–3): 147–65] appears a very valuable one.

Discusses work of VOK’s brother [Alexander] on Sagitta and the ascidians.

Contributor:
Darwin Correspondence Project

DCP-LETT-9722

From:
Charles Robert Darwin
To:
Friedrich Theodor Köppen (Fedor Petrovich Keppen)
Date:
18 Nov 1874
Source of text:
Archive of the Russian Academy of Sciences, St Petersburg branch: SPBB ARAS (Fond 92. Register 1. Folder 112. P. 3, 3 r)
Summary:

Thanks FTK for telling him of Jahn’s work [see 9719], of which CD had not heard. It would have been of greatest use in writing Descent.

Contributor:
Darwin Correspondence Project
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