Search: Darwin, C. R. in addressee 
Dobell, H. B. in author 
1870-1879 in date 
Charles Darwin in collection 
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From:
Horace Benge Dobell
To:
Charles Robert Darwin
Date:
6 Oct 1871
Source of text:
DAR 162: 191
Summary:

Asks CD’s opinion of his suggestion that a distinctive mark of species may be the duration of pregnancy, incubation, or germination.

Contributor:
Darwin Correspondence Project