(1

Mimosa pudica. Cotyledons of

1877 Bloom

Nov. 23d Scratched with needle for 1' whole upper surface (or lower surface of one) of 2) of a Cot. of 2 seedlings, just taken out of hot case, & neither after 20' had moved in the least. Certainly not sensitive. No bloom on upper or lower surface for water clings to it. Keep Drops of water cause no movement

[in margin:] Sleep & Development

Lettington says last night at nearly 6° P.m Cots almost closed & this morning at 7° 20' Nov. 24th only partially open.: at 7°.30' P.m. the 2 cots formed an angle together of less than 90° instead of 180°; & at 10° 35' P.m were nearly but not quite closed. At 7° a.m. (having been kept in darkness) Nov. 24th rather considerably more open & when taken to Hot-house was found at 8° 25' quite expanded.—

Nov. 24th Kept seedlings for some hours in case temp. only 69-70°: Cots in this [sketch] S.E. side.

Day rainy & uniformly cloudy, kept brown paper in front.— Cot moved over 1 division of micrometer in 1'. 45"— over 2 divisions in 3'. 50"— Then started fresh & moved over 5 divisions ie 1/100 of an inch in 7' 11". During the whole time I had continually to alter focus as the Cot was steadily rising, whether there was also nutation of stem, I know not, but as I think probable, as the mere rising of the almost horizontal Cot. could hardly have made point smooth margin pass so quickly over divisions of micrometer. (over)

[in margin:] These observations must be given

Keep for Chapter of Summ of movements of Cots

2

Mimosa pudica

The rising of Cots. I think due to very dark day & paper before microscope; when paper removed, the Cots. expanded a little bit did not sink down horizontal

At 3° P.m the case was up to 77°F., & now end of Cot passed over 5 divisions of micrometer (ie 1/100 of inch) in 5' 25".

Nov. 24th. 6° 20' P.m. very nearly shut, plants had been kept very hot all day in case. 10° 15 P.m. 1 very nearly but not quite shut, the other a little open. — 2° 30 a.m middle of night one almost completely shut, but surfaces not in actual contact the other a little more open.

Nov. 25th Kept 2 pots in case very hots & then brought into study, & then went so fast asleep that Cots. in close contact & vertical.

Nov. 26. Scratched & pinched a mature Cot. no movement.

Jan 2d Third compound leaf above Cots, sensitive to touch & drop of water, but the leaflets do not close together. Bloom tolerably perfect. (over)