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Jackson, H. W. in correspondent 
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From:
Henry William Jackson
To:
Charles Robert Darwin
Date:
20 June 1874
Source of text:
DAR 47: 203–4
Summary:

Cites instances of invariable correlations of colour he has observed in cats, dogs, and sheep. [See Variation, 2d ed., 2: 316.]

Contributor:
Darwin Correspondence Project
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