The Power of Movement in Plants

The Power of Movement in Plants

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The Power of Movement in Plants by Charles Darwin, Sir Francis Darwin

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1880

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The Power of Movement in Plants

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Book Excerpt

to the light, which are so general throughout the vegetable kingdom, and occasionally from the light, or transversely with respect to it, are all modified

* See Mr. Vines' excellent discussion ('Arbeiten des Bot. Instituts in Würzburg,' B. II. pp. 142, 143, 1878) on this intricate subject. Hofmeister's observations ('Jahreschrifte des Vereins für Vaterl. Naturkunde in Würtemberg,' 1874, p. 211) on the curious movements of Spirogyra, a plant consisting of a single row of cells, are valuable in relation to this subject.

[page 4] forms of circumnutation; as again are the equally prevalent movements of stems, etc., towards the zenith, and of roots towards the centre of the earth. In accordance with these conclusions, a considerable difficulty in the way of evolution is in part removed, for it might have been asked, how did all these diversified movements for the most different purposes first arise? As the case stands, we know that there is always movement in progress, and its amplitud

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