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Semper, C. G. in addressee 
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From:
Charles Robert Darwin
To:
Carl Gottfried Semper
Date:
21 Jan [1874]
Source of text:
Christie’s (dealers) (8 June 2005)
Summary:

Asks for information about the title and date of Semper’s essay disputing CD’s theory of coral reefs.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Carl Gottfried Semper
Date:
30 Apr 1877
Source of text:
J. A. Stargardt (dealers) (March 1994); Kotte Autographs (dealers) (March 2016)
Summary:

Is honoured by CGS’s dedication [see 10942].

His observation of the dorsal eyes of Onchidium is interesting and surprising.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Carl Gottfried Semper
Date:
18 July 1877
Source of text:
Universitäts- und Landesbibliothek Düsseldorf (slg 60/Dok/56)
Summary:

Thanks for CGS’s work [“Über Schneckenaugen” (1877)].

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Carl Gottfried Semper
Date:
19 July 1878
Source of text:
Universitäts- und Landesbibliothek Düsseldorf (slg 60/Dok/57)
Summary:

Offers to give CGS a writing machine.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Carl Gottfried Semper
Date:
24 July [1878]
Source of text:
Universitäts- und Landesbibliothek Düsseldorf (slg 60/Dok/58)
Summary:

Pleased CGS will accept machine.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Carl Gottfried Semper
Date:
26 Nov [1878]
Source of text:
Universitäts- und Landesbibliothek Düsseldorf (slg 60/Dok/59)
Summary:

Discusses views of Moritz Wagner on modification of species. Two different cases: one in which a species is modified in the same country and cases in which a species splits. Glad CGS is taking up subject.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Carl Gottfried Semper
Date:
30 Nov 1878
Source of text:
Universitäts- und Landesbibliothek Düsseldorf (slg 60/Dok/60)
Summary:

Discusses effect of isolation on species modification and the views of Moritz Wagner on the subject.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Carl Gottfried Semper
Date:
[after 6 Dec 1878]
Source of text:
DAR 202: 120v
Summary:

Gives CGS permission to use his letters in any way he thinks fit.

Discusses the direct effect of external conditions as an agent of change in organisms; has encountered many cases since the publication of Origin.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Carl Gottfried Semper
Date:
2 Oct 1879
Source of text:
Universitäts- und Landesbibliothek Düsseldorf (slg 60/Dok/61)
Summary:

Discusses CGS’s account of Pellew Islands. Still believes atolls and barrier reefs in Pacific indicate subsidence. But cases like Pellew Islands, if frequent, would make his conclusions of little value.

Contributor:
Darwin Correspondence Project
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