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Semper, C. G. in addressee 
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From:
Charles Robert Darwin
To:
Carl Gottfried Semper
Date:
6 Feb 1881
Source of text:
Universitäts- und Landesbibliothek Düsseldorf (slg 60/Dok/62)
Summary:

Comments on CGS’s The natural conditions of existence [1881] and on views of Moritz Wagner on geographical distribution.

Discusses cause of variability.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Carl Gottfried Semper
Date:
19 July 1881
Source of text:
Universitäts- und Landesbibliothek Düsseldorf (slg 60/Dok/63)
Summary:

Thinks CGS right not to reply to critical article by Lankester.

Discusses direct action of environment as cause of variability; the finding of Hermann Hoffmann that direct action of environment affects plants very little.

Contributor:
Darwin Correspondence Project