(1

July 30th

Pisum sativum

1º. set stick to young tendril bowed from touch.— Young tendril single or slightly forked distinctly sensitive This tendril became in about 2º quite straight; bow right downwards. 2º mark in glass to edge of leaf 2º 22' 2d mark.

3º. 30 3d mark from light 4. 48' 4th mark

5. 15' at line 2. 6º 45' between 1 & 2

7º 35' — at 2.

Leaf carrying tendril with 2 upper leaflets alone open travelled about a good deal, & was sometimes upright & sometimes inclined; I think it returned to starting point in one case in 2º. 10'. — It moved from light.—

The young tendrils with only a single fork are very sensitive on both sides turning to whichever touched; but concave side, I think most sensitive. — A tendril only 1 inch long moved.

[1v]

Grapnel-like tendrils in K. Garden did not curl when hooked & pulled for hours by coarse thread. Some of them did after 18º.—

Augt. The tendrils spontaneously curl down on lower side into hooks, when not excited. Each t. having 2 or even 3 lateral pairs— making grapnel: but in this state the irritability is feeble & ultimately disappears; & the top becomes coiled into helix.—

Augt 2d. Occasionally the tendrils were certainly affected by 6 inches of cotton thread — of weight given under Cissus. 1/7' of a grain

(2

Pea

The leaves if these young plants (about 6 inches high) have only 2 leaflets. The tendrils are very sensitive — a single light touch with thin stick quickly caused curling movement — 2 inches of black cotton did not cause movement.—

The internode which carried the upper leaf, & which is in a line with the peduncle of leaf, certainly moves spontaneously from side to side, or in ellipse; but only to a little distance.

I then tried internode at top of T. then in 2º the peduncle of leaf certainly moved to one side; but afterwards for 3º hours the peduncle did not seem to move though the tendril did move from side to side in about a hour. This tendril clearly has spontaneous movement.

(3

Pea

I observed a tendril on another plant, putting hemispherical glass cover & recording point to which the main lower & straight part of tendril pointed. I had previously tied the peduncle to a stick close to base of tendril.

This tendril was only 1 1/8 inch in length; & plant itself 7 inches in height—

[in margin:] say tendril moved spontaneously 1 1/8 long

It first moved in straight line for 37' & then began to return & returned for 1º. 23: it then stood still for 22': [sketch] 1 2 3 4 & proceeded for (3) these length, which was short, during 1. 35', & then came back (4) for very short distance during 1º.— Being tied up probably checked proper elliptic movement.— Any how tendril moves backwards & forwards; & internode & probably peduncle all harmoniously.—

[3v]

Internode

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Pea

Aug. 1'. I yesterday at night cut off tendril & secured internode close to base of peduncle of leaf: I watched this peduncle from 9º. to 7º P.m., & there was no true movement: there was depression towards light, as on other leaves; for plant had been all early morning in greenhouse. So I may conclude peduncle no movement, slight bending observed yesterday caused probably by weight of the 2 leave & tendril.—

[in margin:] Petiole does not move

I watched all day from about 9º till 9º & recorded on hemispherical glass movement of upper young internodes, without regarding the tendril: it had been in greenhouse with light overhead, & then placed on table in middle of room, first moved to light during 1º. 40', then it returned from light for 1º. 30'; then moved in oblique line;

[4v]

The tendrils generally become all in a mass from latent ones seizing same support — old hooks certainly will not clasp. —

I saw one of side tendril — never main central branch, break up into spiral with reverse kink.—

(5

Pea (See figure)

Altogether it moved in very irregular spire; making for first half of day two figures approaching to ellipse s & then towards evening two smaller circles. The ellipses were nearly at right angles to each other, so that it sweeped a quarter: for first half moved with hand of watch & then for min reverse of watch.— The figure may be said to have been traced by plant supposing a pencil 2 inches long had been fixed to peduncle of leaf, instead of tendril. It swept (allowing for movement from light) a space 4 inches long in one direction & 3 1/4 in another; but as tendril moves itself & is, when grown much above 2 inches in length, the space swept for a support wd be considerably more. Though not recorded internode went on moving at 11º. P.m.

[5v]

Aug 22 I am now certain that from repeated trials that concave side of tendril far more sensitive to touch. — Searching

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Pea

The tendril certainly are only sensitive on lower side, as in Gourds. —

On all sides in Peduncle of Tropæolum, so not connected with leaf origin —

Only the tendril on summit rotate; the other keep sensitiveness longer than movement.—

Aug 22d. [illeg] Garden Light I tied top of leaf (with 2 pairs of leaflets) so that tendril alone could move & it performed a good ellipse in 1º. 30'.— I then turned plant in opposite direction, & the top of tendril did not turn to dark side.— The tendrils were highly sensitive & therefore ought to have avoided light according to Dutrochet; it does not seem that he tied internode & examined movement of tendril separately — He admits that

[6v]

Everlasting Pea. Lathyrus. I can only say that tendril sensitive on concave side to touch— My plant was young & feeble, & I could see no movement in tendrils or internodes—

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Pea

that old tendril which is losing sensitiveness does not avoid light— — I suspect that movement of tendril & internode did not go at same rate or together — D. is mistaken I feel sure about movement of peduncle of footstalk. The ellipse was parallel to window.—

Aug 23d. took another nice young tendril with very sensitive & tied top of peduncle: it first performed a circle, & then ellipses bigger & then at right angles to window, ie in line of light.— The tendril travelled more than 180º, for it bent down at both ends below its horizon.

[in margin:] Light

The Ellipse did not move quite in same line.— Certainly the tendril moved fully as much down towards light, as

(8

Pea

from it & certainly moved as quickly one way as other: if any difference quicker to light— — Dutrochet mistaken. — I placed tendril at first vertical & light came in laterally.—

[20bv]

Dutrochet 1º. 20' p 994

reversed movement. p 1001.