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.
| 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) |
| 19, 3rd circle | 3 | 0 | |
| 20, 4th | 4 | 20 |
Tecoma jasminoides (Bignoniaceæ) moves against the sun.
| H. | M. | ||
| March 17, 1st circle was made in | 6 | 30 | |
| 19, 2nd | 7 | 0 | |
| 22, 3rd | 8 | 30 | (very cold day) |
| 24, 4th | 6 | 45 |
Thunbergia alata (Acanthaceæ) moves against sun.
| H. | M. | ||
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April 14, 1st circle was
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