[113]

Sep 19

Mimosa angle between 2r.y petioles

From 12.23 pm to 4.14 pm the angle between the lea petioles changes from 61° [-] 54 [=] 7° to 54°; during this interval 3 of 3hrs 51 m ten observations were made which show that the angle sometimes diminishes & then increases again & so on.

The 10 observations are [data not transcribed]

From 4.14 to 6.45 the angle diminished & at 6.45 it was only 2°; this diminution was apparently steady as the angle was always smaller & smaller & never got big again {except once when it increased by 2° which may be an observation error}

The observations were not so more numerous in the evening as by 10 10 being made from 4.25 to 6.45 ie in 2 hrs 20mn

Temperature 20° to 23°C

On the following day observations f not so frequent but the angle was certainly more constant which may have to do with slightly lower temperature

[calculations not transcribed]

[114]

Nutation of primary petiole

Mimosa pudica No 1 Sep 28

Grass stalk which is the index projecting 75mm beyond fork of 2ndy petioles; looking & points to the main light – vertical glass – Sun & clouds – Thermometer hung close by. No fixing wanted to plant decimals of estimated old 110.0

[data not transcribed]

From glass to joint of Mim 125 mm about main petiole

[114v]

S

S 19

M 20

TU 21

W – 22

Th 3

F 4

S 5

[115]

Dr H Sep 28 Mimosa

[data not transcribed]

[116]

Mimosa Hot case (2) Sep 28 grass quite square to glass leaflets shut but not so the 2ndy petioles

[data not transcribed]

[117]

Mimosa ‒ main petiole (traced by foreshortening a grass index, on vertical glass

Hot case No 3, I found the leaf weight down & cut off some of the grass & moved plant nearer light glass. Fork of 2ndy petioles to tip of grass = 92mm

Joint of movement of main petl to ditto 150

Joint to fork ie (real moving arm) 58

Joint to glass when petiole Horizontal 226

when horizontal it multiplies 226 [÷] 58 times; about 4 times

[data not transcribed]