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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-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
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