[7]

Amphicarpæa

circumnutation & sleep of leaflets.

A young leaf on stem closely twined round stick — Length of leaf 2 1/4 inches long with petiole.— distance of tip 9 inches from vertical glass under skylight. (Temp on 10th & 11th 17 1/2 to 18 1/2 C.) Filament fixed [sketch] transversely across tip of terminal leaflet. [sketch]

When mark in Tracing fall & travel to left, leaflet sank — at & vice versâ. This bad plan for lateral movement inclination of blade to either side in circumnutation exaggerate movement in tracing, whilst mid-rib may not have moved; but my object was to see whether leaf moved much after it had sunk down vertically & gone to sleep; & this was shown to be the case, for it moved quite as much as when awake — See on 10th the movement between 7° 15' P.m when asleep. & 10° 40' P.m.—

On the 11th so again at between 8° 5' 7° 16' & 10' 53' P.m, movement during the day excessively complicated — sleep may movement is clearly only modified circumnutation — it must be remembered that filament transverse across tip of leaflet, & as this is swayed from side to side one end of filament wd be tilted up & the other end depressed. — During night Leaflet not only sank down but later in night but moved backwards on towards coiled stem & stick.—