(1

July 30th

Pisum sativum

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

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

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

7° 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 2°. 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 18°.—

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 2° the peduncle of leaf certainly moved to one side; but afterwards for 3° 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 1°. 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 1°.— Being tied up probably checked proper elliptic movement.— Any how tendril moves backwards & forwards; & internode & probably peduncle all harmoniously.—

[3v]

Internode

(4

Pea

Aug. 1'. I yesterday at night cut off tendril & secured internode close to base of peduncle of leaf: I watched this peduncle from 9°. to 7° 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 9° till 9° & 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 1°. 40', then it returned from light for 1°. 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 11°. P.m.

[5v]

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

(6

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 1°. 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—

(7

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 180°, 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 1°. 20' p 994

reversed movement. p 1001.