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Darwin, C. R. in correspondent 
1860-1869::1869::08 in date 
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From:
John Blackwall
To:
Charles Robert Darwin
Date:
10 Aug 1869
Source of text:
DAR 82: 82–3
Summary:

Immature male spiders usually resemble in colour the females of their species of the same age. In some species colours of sexes differ when mature.

Contributor:
Darwin Correspondence Project
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