[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 7º 30' A.m. to 4º 50' P.m. Temp of Case during 9º 20', generally 80 to 84º, for a short time being 95º.— Day uniformly cloudy till 12º to 1º & 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 7º 25' & 10º 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 7º 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 10º 37' to 4º 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.