[21]

[in margin:] Sleep

Coronilla rosea— pot in greenhouse. Sept 14. 1879— Leaves with many opposite leaflets— which are extended horizontally during day with their midribs at rt. angles to petiole. at night rise up so as to come nearly & with younger leaves in close contact, at the same time they bend back toward base of petiole, so that these midribs now form angles of between 40° & 50° with main petiole in a vertical plane, instead of angle of about 90° with them as during day — The main petiole is slightly arched downwards during day, but straighten itself at night, & rises up in 3 measured cases form 3° to 6° 9°

10° P.m. — in 2d cases from 11° to 33° [-] 11 [=] 22°, & in third case from 5° to 33° [-] 5 [=] 28 above horizon (above horizon at 10 P.m)

[Movement in plants, pp. 355-6: "Coronilla rosea (Tribe 6).—the leaves bear 9 or 10 pairs of opposite leaflets, which during the day stand horizontally, with their midribs at right angles to the petiole. At night they rise up so that the opposite leaflets come nearly into contact, and those on the younger leaves into close contact. At the same time they bend back towards the base of the petiole, until their midribs form with it angles of from 40° to 50° in a vertical plane, as here figured (Fig. 146). The leaflets, however, sometimes bend so much back that their midribs become parallel to and lie on the petiole. They thus occupy a reversed position to what they do in several Leguminosae, for instance, in Mimosa pudica; but, from standing further apart, they do not overlap one another nearly so much as in this latter plant. The main petiole is curved slightly downwards during the day, but straightens itself at night. In three cases it rose from 3° above the horizon at noon, to 9° at 10 P.M.; from 11° to 33°; and from 5° to 33°—the amount of angular movement in this latter case amounting to 28°. In several other species of Coronilla the leaflets showed only feeble movements of a similar kind."]