[99]

Rhodichiton volubile petiole takes 1/2 or full turns

Mar 18. 64

Stem thin like twiner leaves heart shaped with posterior lobes so developed as to be peltate & at right angles to long peduncle.

Hence like Tropeolum. May they not act like hook? Mem. Clematis.

Very young leaves with narrow lamina only 1/10 of length of ordinary leaf are sensitive to very slight rub to pressure of small stick or loop of string & move in any direction in which touched. After moderate curvature very slowly recover themselves. The youngest leaf after a rub curved just perceptibly in 1°. 10'

[99v]

More curved in 3° 10' & considerably arched downwards in 5° 40'.

Some other young leaves did not move in 5° 30' but were curved in 36° 6°. 30' The little loop of string caused movement in 5° but none in 4° 30'.

April 1' Moves with sun, shoot bent sweeps large circle; 1st € in morning cold in 5°. 30' second circles as day became warmer in 4°. 10'

5 inches of string (= .82 gr) caused very young leaf to bend

10 inches of thread (.25 gr) do do

5 do do (.125) do do

2 1/2. do do (.062) This clasped their thread so tight as hardly to be drawn out

Twines beautifully, each leaf that touches bending round & to stick

After making one turn, reversed & twined other way