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Letter 11690

Darwin, C. R. to Darwin, Francis

12 Sept [1878]

    Summary Add

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    Julius von Sachs's views on stomata seem largely correct, but CD cannot understand how leaves can survive submerged for such long periods.

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    Has been observing Drosera and concludes that none of the movement of the tentacles is caused by growth.

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    Suggests observations to show role of pulvinus in leaf movement.


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