The Movements and Habits of Climbing Plants. Чарльз Дарвин

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СКАЧАТЬ plant: follows the sun. Three shoots, cut off a plant, and placed in water made circles in 3 hrs. 10 m., 5 hrs. 20 m., and 7 hrs. 15 m.

      Wistaria Chinensis (Leguminosæ), in greenhouse, moves against the sun.

	H.	M.
May 13, 1st circle was made in	3	5
13, 2nd	3	20
16, 3rd	2	5
24, 4th	3	21
25, 5th	2	37
25, 6th	2	35

      Phaseolus vulgaris (Leguminosæ), in greenhouse, moves against the sun.

	H.	M.
May, 1st circle was made in	2	0
2nd	1	55
3rd	1	55

      Dipladenia urophylla (Apocynaceæ) moves against the sun.

	H.	M.
April 18, 1st circle was made in	8	0
19, 2nd	9	15
30, 3rd	9	40

      Dipladenia crassinoda moves against the sun.

	H.	M.
May 16, 1st circle was made in	9	5
July 20, 2nd	8	0
21, 3rd	8	5

      Ceropegia Gardnerii (Asclepiadaceæ) moves against the sun.

		H.	M.
Shoot very young, 2 inches in length	1st circle was performed in	7	55
Shoot still young	2nd	7	0
Long shoot	3rd	6	33
Long shoot	4th	5	15
Long shoot	5th	6	45

      Stephanotis floribunda (Asclepiadaceæ) moves against the sun and made a circle in 6 hrs. 40 m., a second circle in about 9 hrs.

      Hoya carnosa (Asclepiadaceæ) made several circles in from 16 hrs. to 22 hrs. or 24 hrs.

      Ipomæa purpurea (Convolvulaceæ) moves against the sun. Plant placed in room with lateral light.

1st circle was made in 2 hrs. 42 m.	Semicircle, from the light in 1 hr. 14 m., to the light 1 hr. 28 m.: difference 14 m.
2nd circle was made in 2 hrs. 47 m.	Semicircle, from the light in 1 hr. 17 m., to the light 1 hr. 30 m.: difference 13 m.

      Ipomæa jucunda (Convolvulaceæ) moves against the sun, placed in my study, with windows facing the north-east. Weather hot.

1st circle was made in 5 hrs. 30 m.	Semicircle, from the light in 4 hrs. 30 m., to the light 1 hr. 0 m.: difference 3 hrs. 30 m.
2nd circle was made in 5 hrs. 20 m. (Late in afternoon: circle completed at 6 hrs. 40 m. P.M.)	Semicircle, from the light in 3 hrs. 50 m., to the light 1 hr. 30 m.: difference 2 hrs. 20 m.

      We have here a remarkable instance of the power of light in retarding and hastening the revolving movement. (See Errata.)

      Convolvulus sepium (large-flowered cultivated var.) moves against the sun. Two circles, were made each in 1 hr. 42 m.: difference in semicircle from and to the light 14 m.

      Rivea tiliæfolia (Convolvulaceæ) moves against the sun, made four revolutions in 9 hrs.; so that, on an average, each was performed in 2 hrs. 15 m.

      Plumbago rosea (Plumbaginaceæ) follows the sun. The shoot did not begin to revolve until nearly a yard in height; it then made a fine circle in 10 hrs. 45 m. During the next few days it continued to move, but irregularly. On August 15th the shoot followed, during a period of 10 hrs. 40 m., a long and deeply zigzag course and then made a broad ellipse. The figure apparently represented three ellipses, each of which averaged 3 hrs. 38 m. for its completion.

      Jasminum pauciflorum, Bentham (Jasminaceæ), moves against the sun. A circle was made in 7 hrs. 15 m., and a second rather more quickly.

      Clerodendrum Thomsonii (Verbenaceæ) follows the sun.

СКАЧАТЬ

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	H.	M.
April 12, 1st circle was made in	5	45	(shoot very young)
14, 2nd	3	30
18, a semicircle	5	0	(directly after the plant was shaken on being moved)