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 |