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Darwin-Hooker Letters : Letter from C. R. Darwin to J. D. Hooker   25 March [1878]

Darwin, Charles Robert

Darwin-Hooker Letters

<p style='text-align: justify;'>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.</p>


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