Letter 11615
Darwin, C. R. to Darwin, Francis
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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.