[24]

Cassia floribunda old Greenhouse var. (I have got name somewhere

A cut down bush had thrown up vigorous shoots — a young leaf selected — bearing 4 pairs of leaflets, main petioles 3 3/4 long — filament affixed to one of terminal leaflets, & petiole secured to stick close behind joint apex 5 1/2 from vertical glass.— This leaflet 1 10/12 5/6 long—

[sketch]

Observed under skylight traced on vertical glass, from midday of 13th to morning of 17th— see Tracing. (Temp too low. viz on 13th. 16°—17°1/2 — on 14th 16-16 1/2; on 15' 15-15' 1/2) — From tracing it is clear that in morning between about 8° or 9° & 2° or 3' leaflet circumnutates chiefly up & down, & after this hour sinks rapidly & hangs vertically down rather early in the evening; rises during the early morning, so that by 1/4 before 7° stands at high level. It is remarkable & inexplicable that on 14th leaflet did not rise up to even moderate height till 9° 10' a.m; & then did not circumnutate much; but rose only a little more & again descended.— There can be no doubt that sleep-movement a modification of circumnutation.— At night on 15th between 6° P.m & 10° 30', P.m whilst filament was hanging perpendicularly down, it swayed backwards & forwards laterally for the movement was traced on glass. — The tracing on the 16' is a separate figure.— The "night position" may imaginary.─