[344]

Cotyledon. Primula Sinensis 1877 (stem not secured)

Oct. 9. The 2 Cots. placed with line joining them transversely to light. Bit of paper pointed & bent into rectangle, fixed, projecting 7/8 of inch & gummed the one cot. with pointed mark behind & vertical glass in front. — High broken N.E. clouds. Cots fall fell from 8º. 40' a.m. to 4º. 40' with mu zig-zagging

First dot 8º. 44' a.m. Last 10º. 45'. When Cotyledon falls or open the line moves in curve to right, & when Cot. rises moves to left Cot rose from 4º. 40' to 10º 45 P.m.

This is main effect, but there must be some lateral or oblique movement. It follows that in morning this morning Cot. opened f. fell or opened, & that from .6º. 20' to 10º 45' the cot. was rising. But in middle of time complicated movements up & down.— Next morning Oct 10' was at cross, & then moved to right, so that Cot. was then opening

(Oct 10'. The same Cot. in same position. End of Bristle first moved to left right & then a little up. Diagram 2. & then down & then in zig-zag to 1º. 3. The movement was thus far more simple than yesterday & I then observed, that first little-leaf of adjoining plant had caught cot. by base of paper, & when freed it suddenly changed its position.

A new tracing was now begun at 1º. 5 (see Diagram 3.) & now resumed former character, was traced to 10º 43', Cot in morning rose fell (thus entangled) from 1º to 4º zigzag from 4º 30' to 10º 40 7º 20 rose & then fell again so movement goes on long after dark, & the latter movement was one of depressing the Cot. & this agrees with no signs of ordinary sleep in the young plants. The little plant

(over)

[344v]

besides the 2 Cot. had one little leaf 1/4 of inch long from apex to base.

The tip of bristle paper was only 3/8 of an inch in advance of triangular card behind plant, & the vertical glass. 9 3/8 inches in front of pointed paper gummed on leaf. As Cot. bonded to pointed bit of paper 7/8 of an inch long wd of course in increase greatly the appeared distance travelled by the Cot. up & down; but besides this the relative distance of glass — leaf & card behind wd increase the movement about 26 times. The magnifying power varies