[72]

Lupinus luteus

Sept 3.

8° 20' P.m.

asleep

[3 annotated diagrams]

As petioles are declined, in order that the leaflets to shd become symmetrically highly inclined it is necessary that the outer & longer leaflets shd bend upwards in a greater degree than the inner & shorter ones. Hence if petioles are pushed vertical, the backs of the outer & longer leaflets are seen from vertically above. Shorter leaflets always on side of axis. First-formed leaves 4 leaflets, afterwards.

Sept 4' 10° 30' A.m. awake. From these observations it is clear that the hollow cone of leaflets is far more open during day than at Night. It does not appear that petiole approaches axis at Night. on the contrary it is closer during the day by 9° 30!!!!

[diagram]

(Sept- 9th 10' measured angles of petioles & stem of 2 other leaves (1) the younger leaf formed with stem above angle of 11° whilst asleep awake & when awake asleep 11° 17° so that fell the petiole fell 6° during sleep!

(over)

(2)) 2d & rather older leaf formed angle of 27° with stem above, & when asleep only angle of 25°, so that fall the petiole fell 2° during sleep.—)

(over)

[72v]

Sept. 26. — Brought plants, now grown pretty tall into House & several leaves — of which 4 were marked, formed vertical stars, next morning these leaves were almost horizontal. 3 other leaves had all leaflets depending like L. pilosus, were marked & next morning were horizontal. So including younger state the leaves sleep in 3 different ways!! like L. mutabilis.—

[73]

Lupinus luteus 1877

Sept. 26 — 2 Leaflets observed at ∠ to light.; petiole stem secured close beneath leaflets one of 3 longer leaflets, which at night rises & makes star vertical, now moved obliquely upwards & towards light until 12° 45', when it began to fall in zig-zag line. see diagram I.

A second leaflet, almost in middle, rather one of the shorter ones, fell all days; & at 11° 15' began to zig-zag, as shown in diagram (2). These zig-zag represent the loops in Trifolium & cotyledon of Cassia. It is not clear use of the downloads movements, for leaflet has chiefly to rotate on axis to put itself in position of sleep.—