Page:Darwin - On the movements and habits of climbing plants.djvu/2

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I led to this subject by an interesting, but too short, paper by Professor Asa Gray on the movements of the tendrils of some Cucurbitaceous plants. My observations were more than half completed before I became aware that the surprising phenomenon of the spontaneous revolutions of the steins and tendrils of climbing plants had been long ago observed by Palm and by Hugo von Mohl, and had subsequently been the subject of two