74

Dec. 24th 10°– to 11° A.M.

[sketch]

In cooler Hot-House where plants long kept, & in same position with respect to light

tube 2" out; eye-piece

object glass 2 inches

micrometer .1/100 used.

each division = 1/500 of inch

times of transit over 1 division

 0.55 seconds

 " 0.65

 " 1..45

 " 2.40

 " 1.20

 0.40   "

LD

Mimosa marginata.

74v

24 [×] 60 [=] 2640

2 60

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.

 s m

 M. Marginata 15 1

5 1

25. 1

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 observation show spontaneous movements.

77

Friday Dec. 27. 1873 11h 30m

1 division in 55 sec away from light —

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

the other leaf in 45 sec taken very soon after

50

60

At 2.30 it took 3 or 4 minutes to move across a division

Day obscure no vibrating movement!!!!

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

Leaf may have

L. Darwin

Mimosa marginata