Search: Hooker, J. D. in author 
1840-1849::1844::09 in date 
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Darwin, C. R. in correspondent 
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From:
Joseph Dalton Hooker
To:
Charles Robert Darwin
Date:
[c. 3 Sept 1844]
Source of text:
DAR 104: 221
Summary:

Suggests there is a direct relation between temperature and abundance of plant species.

Contributor:
Darwin Correspondence Project