Movements and Habits of Climbing Plants
Movements and Habits of Climbing Plants
Book 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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