[25]

The Cots — go to sleep at night & almost completely close (Is this used? I doubt)

Cassia mimosoides

Ap 21st First true leaf asleep, petioles rise greatly,— leaflet approach each other so as to touch, & move toward apex so much that their midribs extend almost parallel to petiole supporting the leaflet; do not turn downwards like most species.— The cotyledons at this late age vertical, though they had been horizontal during the day.—

[in margin:] Sleep of leaves

[26]

Cassia mimosoides

May 28 27' & 28 1878. young plant—

Leaflets certainly do not sink beneath main petiole but rotate so as to point to apex.

I believe main petiole was at 10° 30' P.m. 27° above horizon, & next morning at 10° 45' was 19° beneath horizon.

May 28th 10° 30' P.m. petiole was 27° above horizon & during day was beneath horizon.—

Petiole rose 8° at night

[diagram]

63 63

90 [-] 63 [=] 27