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Semper, C. G. in addressee 
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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