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To J. D. Hooker   19 July [1856]

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Summary

Multiple creations.

Necessity for crossing in plants and animals: JDH to take up the subject; explains separate sexes in trees.

Continental extensions.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  19 July [1856]
Classmark:  DAR 114: 171
Letter no:  DCP-LETT-1932