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Passiflora gracilis 1877 (Sleep)

Oct 12. Youngish leaf facing light & hanging down obliquely traced on vertical glass — seen obliquely 8° a.m first dot 8° 27' had risen. 8° 51' greatly down. 9° 16 down almost out of glass, changed position of marks; to 9° 28' still sinking rapidly to 11°. 46' still sinking. I then thought might be nutation of stem: see Climbing Plants?

(10°. 12° 16' tied stem close beneath petiole to a stick & made fresh dot. See diagram (1): continued to sink till 5° 10' almost out of glass.)

(changed marks & at 7°. 45' new dot. (see diagram 2) & 10° 38' last dot slightly zig-zag & obliquely down; so fell all day. Next morning Oct. 13th at 7° a.m. (diagram 3.) had risen greatly & continued till 8°. 5' to rise; & then a new tracing begun.)

(Oct 13th. first dot (everything in same position, distance of vertical glass to paper mark behind bristle 9 5/8,— to tip of bristle 9 inches, so tracing much magnified/ first dot at 8° 19, rose to 8° 51; this end of upward nocturnal movement, as also shown by tracing of Oct 14th; then fell greatly: at 11° 5' began to zig-zag till 5° 5' (usual law) & then began to fall till 5° 46. when went beyond range of glass. (see diagram 4. Next morning Oct 14th at 6° 50' point of bristle was under yesterdays black lines; so slided glass & trace as shown to left hand, for the movement were under over those of yesterday; same kind of movement as yesterday. Day with high almost uniform clouds: at night the Bristle was almost vertically down, & the leaf above quite vertically down, whereas next morning it formed an angle of 40° below horizon, so fell 50° at night. (over)

[99v]

Passiflora gracilis 

Oct 14th. I observed the same leaf at night— changing position of mark behind from 5° 4' P.m to 7° 12 straight to right, which implies depression of leaf. At 7° 12' bristle vertically down & then observed to 10° 15' P.m. During this time, [sketch] followed course here represented, which must have been due I suppose to rising or sinking (see below) of petiole, together perhaps with inward movement of leaf itself. It is clear there is movement during night—

Oct 15 angle of Petiole during sleep [sketch]

The petiole of upper leaf at 11° 30' A.m was 26° above horizon; at night at 10° 30' P.m was only 15° above horizon so had fallen 11°; next morning at 11° 45' the petiole' was 10 33° above horizon, so higher than on previous

33 [-] 15 [=] 18

The pet. of next lower leaf (on which all the previous observations were made) was at 11° 30 Am was 15° above horizon, & when asleep at 10. 30' P.m. only 8° above horizon, so had fallen 7°; next morning at 11° 45' at was 13° 8 above horizon.