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Letter 11623

Darwin, Francis to Darwin, C. R.

[21 July 1878]

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    Has been investigating nutational movements of climbing plants; comments on the opinions of Julius von Wiesner and Julius Sachs. Remarks on the sleep movements of certain plants and the mechanism of tendril curvature. Is experimenting with Porlieria.

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    Has visited K. G. Semper's laboratory.

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