[81]

Sleep. 1877

Lupinus arboreus Oct 5-6th. Kept in greenhouse— Four leaflets leaves observed previous afternoon & next morning — The leaflets formed during day a horizontal star; but at night a cone of 108° 30' [sketch], & a second leaf of 107°; so that the each leaflet fell about 36° beneath horizon. The petioles moved very little during sleep, so little & in opposite directions, that safer to say "in no marked manner"

[82]

1877

Lupinus arboreus

Oct 11 moderately young leaf facing light, in nearly position which had stood in greenhouse considerably inclined — Bristle fixed along middle of one of longest leaflets, which extended transversely vertical glass 13 2/8 of inch to pointed card behind leaf. card from end of bristle 1 7/8 of inch. From 8° 40' to 10° 14' went down; then rose z:zagged greatly to 2. 49'; then rose to 3: 57. Then began to fall, which was incipient sleep movement; downward movement rapid, but exaggerated on vertical glass. After 8° was far beyond limit of glass. No doubt the sleep or downward movement wd have been more rapid, but this leaf did not go to sleep so well as on previous night, as happens sometimes in study. The zig-zag shows expenditure of motion.—