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Mimosa pudica.

July 31st & Aug 1. 1878

An old & sick leaf, hardly sensitive, wa had filament fixed along main petiole, & observed in [sketch]

Hot-House — traced on vertical glass – House kept up to nearly 80°F. See Tracing— fell till 10. 19' & then rose, till 5°. 9. by which time great evening fall had commenced

Rose again by early morning, & next morning fell in zig-zag line & then remained in nearly same spot.

A young leaf was observed at same time, but as it rose above my glass — tracing not given — fell till 10° 17, a.m. then rose greatly but by 4° 8' had begun to fall— zig-zagged & then came great nocturnal fall.— By next morning had risen so as to be far above glass by 9° a.m had fallen & come on glass; but 10° 13' had again risen above glass & was still off glass, by 1° 5' P.m, but later in evening no doubt wd have come on glass.— These observations indicate that with Heat, there is a fall in the early morning followed by a rise in the forenoon & this followed by great evening fall & nocturnal rise. ie rises & 2 falls in 24°.—

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Mimosa pudica

The younger leaf, alluded to in last page, (which with from base of petiole to tip of pinnæ was 4 inches in length & was extremely sensitive) was observed & traced on vertical glass — not shaded — stem tied at base of leaf in same manner in Hot-House from 8° 30' on Aug 2d to 7° 12' P.m on Aug 3d, & was then carried in my bed-room for night & observed twice during night & next morning till 11° a.m on 4th —

[in margin:] See Tracing

The tracing on bell-glass covered (with leaf at about same distance in both cases from glass) only be roughly copied on the flat-paper & joined to the tracing on flat vertical glass. During the 2d. & during 12°, of daylight the leaf went down twice thrice & rose twice — During 12° on 3d. down 5 times & up 4 times.— In moving plant, though done carefully the shaking caused petiole to fall suddenly between 7° 12' P.m & 7° 25' P.m on 3d. & after this fall it rose & rose till after midnight, viz aft 12° 50'; for when looked at at 3° 55 had fallen, & continued to fall till 11°, but with 2 rises, showing that cold of room did not stop circumnutation.

Whol At night ie at 1° petiole stood almost upright, whether it always does this I know not.— The important fact is that leaf circumnutates greatly & that sleep movements only an exaggeration of this: We see clearly in many cases that ascending &

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[137v]

& descending line do not coincide.— During the night on the Bell-glass the ascending & descending line to not coincide.— Like circumnutation of cabbage & several other plants — Pulvinus makes an essential difference.