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Movements and Habits of Climbing Plants

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Author: Charles Darwin
Published: 1875
Language: English
Wordcount: 51,349 / 158 pg
Flesch-Kincaid Reading Ease: 64.6
LoC Category: Q
Downloads: 1,168
mnybks.net#: 2034
Genre: Science
Excerpt

ery young, may be seen to bend to one side and to travel slowly round towards all points of the compass, moving, like the hands of a watch, with the sun. The movement very soon acquires its full ordinary velocity. From seven observations made during August on shoots proceeding from a plant which had been cut down, and on another plant during April, the average rate during hot weather and during the day is 2 hrs. 8 m. for each revolution; and none of the revolutions varied much from this rate. The revolving movement continues as long as the plant continues to grow; but each separate internode, as it becomes old, ceases to move.

To ascertain more precisely what amount of movement each internode underwent, I kept a potted plant, during the night and day, in a well-warmed room to which I was confined by illness. A long shoot projected beyond the upper end of the supporting stick, and was steadily revolving. I then took a longer stick and tied up the shoot, so that only a very young internode, 1.75 of an i

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