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Letter 7716

Köppen, F. T. to Darwin, C. R.

25 Apr 1871

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    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.

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    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.

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