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From F. T. Köppen   25 April 1871

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.

Author:  Friedrich Theodor (Keppen, Fedor Petrovich) Köppen
Addressee:  Charles Robert Darwin
Date:  25 Apr 1871
Classmark:  DAR 46.1: 102
Letter no:  DCP-LETT-7716

To F. T. Köppen   28 April [1871]

Summary

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

Author:  Charles Robert Darwin
Addressee:  Friedrich Theodor (Keppen, Fedor Petrovich) Köppen
Date:  28 Apr [1871]
Classmark:  Russian Academy of Sciences, Moscow
Letter no:  DCP-LETT-7723

From F. T. Köppen   13 November 1874

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].

Author:  Friedrich Theodor (Keppen, Fedor Petrovich) Köppen
Addressee:  Charles Robert Darwin
Date:  13 Nov 1874
Classmark:  DAR 91: 84
Letter no:  DCP-LETT-9719

To F. T. Köppen   18 November 1874

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.

Author:  Charles Robert Darwin
Addressee:  Friedrich Theodor (Keppen, Fedor Petrovich) Köppen
Date:  18 Nov 1874
Classmark:  Russian Academy of Sciences, Moscow (92.1.112:3)
Letter no:  DCP-LETT-9722
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1871 (2)
1874 (2)
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