[325]

(Circumnutation of leaf)

Vines Movement of leaves

[in margin:] No evidence that it was not stem

Oct. 22 . (73) young Vines in Pot from Cattell. — Hot-house Var. put glass plate over it & marks marks on the ground & observed apices of 3 leaves from 7° 30' A.m. to 4° 50' P.m. Temp of Case during 9° 20', generally 80 to 84°, for a short time being 95°.—  Day uniformly cloudy till 12° to 1° & then a few gleams of sun. The plant bore 2 little young leaves on summit, & then one about half-grown & 3 inches in diameter which was observed; a 4th leaf, & a 5th leaf which was observed & was nearly of fullest size, & a 7th leaf which was observed, & which was rather old & dark green. — The 3d leaf faced about SS.E. The 5th leaf faced about SS.W. & the 7th faced about N.N.W, & from the light of the Case. Leaf (3) made completed completed a narrow ellipse in 2h 10' (ie from between 7° 25' & 10° 37') & the light cd here have had no influence on this movement.

It afterwards made 2 other incomplete & irregular ellipses during the

day — The next morning Oct 23' at 7° 30' the same apex of leaf occupied a considerably different position to what it did on the 22d. The movement seemed to be altogether lateral lateral & rather considerable; i.e. not up & down.—

Leaf (5) tip of, made during whole day one excessively small circle & occupied nearly the same position as before next morning. It is very odd this leaf did not move more

Leaf (7) tip of, was observed only from 10° 37' to 4° 50' & during this time it made one moderate ellipse & which was not directed towards the light— the next morning the apex did not occupy the same exact position.

I think we must conclude from these facts that the leaves leaves, when temp. high, move spontaneously — like climber-leaves

(The Summit of axis is hooked, it moved a little forwards perhaps to light, & backwards, but did not occupy the same position next morning, I do not know wht to think of this, but believe that it moves spontaneously.