Page:Darwin - On the movements and habits of climbing plants.djvu/19

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18
MR. DARWIN ON CLIMBING PLANTS.

(Dicotyledons, continued.)

a semicircle in 24 h.; subsequently made a circle in between 40 h. and 48 h.; subsequently did not complete a circle in 50 h. Another shoot, however, made a circle in 26 h. 30 m.

Mikania scandens (Compositæ) moves against the sun.

h. m.
March 14, 1st circle 3 10
March 15, 2nd circle 3 0
March 16, 3rd circle 3 0
March 17, 4th circle 3 33
April  7, 5th circle 2 50
April  7, 6th circle 2 40 This circle was made after a copious intentional watering with cold water at 47° Fahr.

Combretum argenteum (Combretaceæ) moves against the sun.

h. m.
Jun. 24, 1st circle . . . . . . . . . 2 55 Early in morning, when the temperature of the house had fallen a little.
Jun. 24, 2 circles, each at an 2 20
average of 2 20
Jun. 24, 4th circle. . . . . . . . . 2 25

Combretum purpureum revolves not quite so quickly as C. argenteum.

Loasa aurantiaca (Loasaceæ). First plant moved against the sun.

h. m. h. m.
June 20, 1st circle . . . . . . 2 37 June 20, 4th circle . . . . . . 2 35
June 20, 2nd circle . . . . . . 2 13 June 22, 5th circle . . . . . . 3 26
June 20, 3rd circle . . . . . . 4 0 June 23, 6th circle . . . . . . 3 5

Second plant followed the sun.

h. m.
July 11, 1st circle . . . . . . . . . 1 51 Very hot day.
July 11, 2nd circle . . . . . . . . . 1 46
July 11, 3rd circle . . . . . . . . . 1 41
July 11, 4th circle . . . . . . . . . 1 48
July 12, 5th circle . . . . . . . . . 2 35 Cool morning.

Scyphanthus elegans (Loasaceæ) follows the sun.

h. m. h. m.
June 13, 1st circle . . . . . . 1 45 June 14, 4th circle . . . . . . 1 59
June 13, 2nd circle . . . . . . 1 17 June 14, 5th circle . . . . . . 2 3
June 14, 3rd circle . . . . . . 1 36

Siphomeris or Lecontea (unnamed sp.) (Cinchonaceæ) follows the sun.

h. m.
May 25, semicircle . . . . . . . . . 10 27 (shoot extremely young).
May 26, 1st circle . . . . . . . . . 10 15 (shoot still young).
May 30, 2nd circle . . . . . . . . . 8 55
June  2, 3rd circle . . . . . . . . . 8 11
June  6, 4th circle . . . . . . . . . 6 8
June  8, 5th circle . . . . . . . . . 7 20 Taken from the hothouse and placed in a room in my house.
June  9, 6th circle . . . . . . 8 36

Mænettia bicolor (Cinchonaceæ), young plant, follows the sun.

h. m.
July 7, 1st circle . . . . . . . . . . . . . . . 6 18
July 8, 2nd circle . . . . . . . . . . . . . . . 6 53
July 9, 3rd circle . . . . . . . . . . . . . . . 6 30