(1

Allamanda Schottii

Dec. 5. Leaves were immersed in water, no silvery appearance: upper surface very smooth but moderately wetted after little shaking— lower surface do but in less degree. These results seem due not to bloom, but to state of surface. (This is the first adaptation

180 [-] 53 [=] [1] 27

On Dec. 5th at 2° 50' P.m. A young leaf of upper whorl was excessively bowed, & the arc of the chord subtended a vertical line above one axis at an angle of 103. This same leaf at 9° 30' P.m. had its arc forming only angle of 53°; but then I do not know how much of this apparent change is due to the blade of the leaf having become very much straighter.

[Graphs in margin]

An older leaf of the next lower whorl, at 2° 50 had its arc forming angle of 81° with axis, & at 9° 30' 86°, so that this had not risen at all during sleep, & I suspect— whole change is due to straightening of the blade of leaf.

(2

Allamanda

N.B. The plants in this House were all watered to day.

Dec. 6th. 12° 30 I measured angle of the same 2 leaves again. That in upper whorl again wonderfully bowed. The axal chord of leaf formed with vertical axis above angle of 126°; but the short petiole between axis & blade formed only angle of 22° with the stem.

At 9° 25m P.m angle of arc chord of leaf 86 1/2, so had risen considerably— angle of short petiole .17 1/2°, so had risen a little but too little to be trusted.

Leaf much less bowed as in diagram, & thus causes the chord of the leaf to rise so considerably; but I see no advantage in this, as leaf wd. be equally exposed to radiation

[in margin:] = See Diagram

Dec. 7th 9° P.m. Horace observed the chord of same leaf of upper whorl & now found it only 55° with vertical above!

Dec. 8th 12° 30' syringed plant for 1m 30' & no effect produced on position of young leaves

Dec. 8th Brought plant into study: chord of leaf at 2° 40' was 130° & at 10°. 30m P.m. was rather greater, & so it was next morning— So does not sleep, but leaves alter their position much from temperature or being watered &c.—

When kept all day in window pot

[70]

Dec. 6th 17 1/2 22°

86 1/2 126°

Allemanda Schottii

All details laid down by plan viz angle of chord of leaf angle of short petiole, length of leaf from base to tip & the convexity, or distance from chord to the bowing of leaf

[annotated diagram]

[70v]

p. 2A

[diagram]

(3

Allamanda

Dec 6' 12° 30m. Lower whorl — angle of Chord of lower leaf with vertical axis above, angle of 96°; but the short petiole, between axis & blade formed angle of of only 38° with the stem.— At 9h 30m P.m. measured the chord again & the angle was now 104°, so there was no rising, on the contrary the leaf must have fallen 8°, or blade become more bowed.