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Köppen, F. T. in correspondent 
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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-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

DCP-LETT-7716

From:
Friedrich Theodor Köppen (Fedor Petrovich Keppen)
To:
Charles Robert Darwin
Date:
25 Apr 1871
Source of text:
DAR 46.1: 102
Summary:

Sends his paper on locusts ["Die geographische Verbreitung der Wanderheuschrecke", Petermann’s Geogr. Mittheil. (1871)]. The effect of the growth of forest land on their increase; meteorological and climatic effects.

Also observations made on increase in mice as a result of increase of locusts, on whose eggs they fed, and of increase of weasels that fed on mice.

Contributor:
Darwin Correspondence Project

DCP-LETT-9719

From:
Friedrich Theodor Köppen (Fedor Petrovich Keppen)
To:
Charles Robert Darwin
Date:
13 Nov 1874
Source of text:
DAR 91: 84
Summary:

Calls CD’s attention to a book that deals with subjects related to both Descent and Expression: Ferdinand Jahn, Die abnormen Zustände des menschlichen Lebens als Nachbildungen und Wiederholungen normaler Zustände des Thierlebens [1842].

Contributor:
Darwin Correspondence Project
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