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Letter 11615

Darwin, C. R. to Darwin, Francis

17 July [1878]

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    Discusses sleep movements of Porlieria.

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    Has read an abstract of Julius Wiesner on heliotropism and geotropism ["Die heliotropischen Erscheinungen im Pflanzenreiche", Anz. Kais. Akad. Wiss. Wien 15 (1878): 137–40] which seems important but is puzzling.

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    Gives details of his observations on climbing plants with reference to comments by Julius Sachs.

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