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To J. D. Hooker   25 March [1878]

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Summary

CD and Frank think they have proved that function of plant sleep is to protect leaves from injury by chilling radiation. Requests plants for experiment to determine whether underside of leaf is hardier than upper.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  25 Mar [1878]
Classmark:  DAR 95: 469–70
Letter no:  DCP-LETT-11443