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Darwin, C. R. in correspondent 
Campbell, G. D. in correspondent 
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From:
Charles Robert Darwin
To:
George Douglas Campbell, 8th duke of Argyll
Date:
23 Sept 1878
Source of text:
Nature , 5 March 1891, p. 415
Summary:

Doubts that "the same well-characterized species should be produced in two distinct countries, or at two distinct times".

Contributor:
Darwin Correspondence Project
Document type
Transcription available