[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 1º. 10'

[99v]

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

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

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