[99]

Passiflora gracilis 1877 (Sleep)

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

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

(changed marks & at 7º. 45' new dot. (see diagram 2) & 10º 38' last dot slightly zig-zag & obliquely down; so fell all day. Next morning Oct. 13th at 7º a.m. (diagram 3.) had risen greatly & continued till 8º. 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 8º 19, rose to 8º 51; this end of upward nocturnal movement, as also shown by tracing of Oct 14th; then fell greatly: at 11º 5' began to zig-zag till 5º 5' (usual law) & then began to fall till 5º 46. when went beyond range of glass. (see diagram 4. Next morning Oct 14th at 6º 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 40º below horizon, so fell 50º at night. (over)

[99v]

Passiflora gracilis 

Oct 14th. I observed the same leaf at night— changing position of mark behind from 5º 4' P.m to 7º 12 straight to right, which implies depression of leaf. At 7º 12' bristle vertically down & then observed to 10º 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 11º 30' A.m was 26º above horizon; at night at 10º 30' P.m was only 15º above horizon so had fallen 11º; next morning at 11º 45' the petiole' was 10 33º 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 11º 30 Am was 15º above horizon, & when asleep at 10. 30' P.m. only 8º above horizon, so had fallen 7º; next morning at 11º 45' at was 13º 8 above horizon.