[27]

Cassia pubescens

An old short plant. Leaf quite young, bearing 4 pairs of leaflets — Petiole 4 inches long — observed under skylight — apex of leaf 7 inches from vertical glass.

Glass filament affixed to one 2 terminal leaflets, with petiole secured to stick close to junction of these 2 leaflets.

[sketch]

See tracing — not much interval — Leaves properly descend perpendicularly for sleep & then become little inverted, but the house perhaps was rather too cold. Temp. from 15 1/2 to 16 1/2 C. — The more interesting point is the zig-zagging & circumnutation between 9° a.m & 2° or 3° P.m, whilst slow ascending movement is changing into at first slow descending movement. — Why on evening of Jun 11th the leaf did not descend properly I know not; it travelled laterally to right & returned next day.— The want of bright light, must always be remembered.—