Visiting his son Horace. Studying action of carbonate of ammonia. Finds similar looking Euphorbia root cells react differently. Intrigued by Dischidia rafflesiana, whose pitchers manufacture manure-water that nourishes adventitious roots. Does Hooker know histologist for detailed study? Julius von Wiesner's criticism of Movement in plants "vivisects" Darwin in "a most courteous but awful manner" [Das Bewegungsvermögen der Pflanzen (1881)].
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