[74]

Dec. 24th 10°- to 11° A.m

[sketch] In cooler Hot-House where plants long kept, & in nearly the same position with respect to light

tube 2" out; eye-piece

object glass 2 inches

micrometer. 1/100 used.

n each division = 1/500 of inch

times of transit over 1 division

0.55 seconds

0.65 [do]

1.45 [do]

2.40 [do]

1.20 [do]

0.40 [do]

 LD [Leonard Darwin]

Mimosa marginata

[74v]

[calculations not transcribed]

[75]

12 o'clock

8 at 50.30

16 at 54.3

that 2 div a minute towards the light sun out

[76]

Dec 24th 2h 15m about. 1/100 micrometer. 2 in of tube.

times taken over 1 division.

m 1 1 1

s 15 5 25

M. Marginata

 

Placing the micrometer at right angles it took 5 min to move 3/4 of a division'. The movement was away from the light.— and in the morning towards it — thus these observations may only be due to light.

LD

I doubt whether any of these observations show spontaneous movements.

[77]

Friday Dec. 27. 1873 11h 30m

1 division in 55 sec away from light

the other leaf in 45 sec taken very soon after

Can this be a horizontal movement like vertical movement of Oxalis & Cassia

Day obscure no vibrating movement!!!!

50

60

At 2. 30 it took 3 or 4 minutes to move across a division

[in margin:] Leaf may have L. Darwin

Sat. Dec 28th— The sun came out in middle of day, weak, & no vibrating movement, after exposed for an hour or two to sun. —

Mimosa marginata