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Clematis flammula

Aug. 26. Peduncles of le whole leaf & side leaflets very long — opposite & alternate so second good circle.— [sketch]

Bent stems t so act as grapnel— say oddly bent at each point, where pair of leaflets arise.

Until peduncles separate from each other not sensitive; when lamina of leaf is 1/4 of inch in length, (full sized leaf being 1 1/2 inch long) the peduncles being in proportion to lamina much more developed is period of most sensitiveness.—

The internodes do not move, so (& it wd be injury if did move) & are not sensitive.

The peduncle of one young leaf (lamina 1/4 inch) had certainly just perceptibly curled bent round stick in 3°. 15'; in another case in 5°. 30', rather

[74v]

Observe as peduncles when once twisted cannot again straighten themselves, it wd be very bad if transient regression caused movement. Hence no use sweeping of internodes

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Clematis flammula

more plainly; & in this latter case peduncle was well curled in 1 round stick in 12°.

A leaf with leaflets 1/2 inch long, just perceptibly curled in 12° & plainly in 24°.

Certainly in 19°— now a loop of 9 inches of strong, caused terminal peduncle & 2 later peduncles of leaves to curl in.

In 6°. 40 six inches of string. I could just barely perceive upward curvature from 6 in terminal peduncle in from 6 inches of string; in 11° a great movement in 24° the peduncle formed a perfect open ring round string: — (30 inches weigh 5.18 gr. — Therefore 6 inches weigh nearly 1.04 (& 3 inches weigh 0.52 gr.) — The six inches had caused X in 48° the peduncles almost to touch the string all round. In 72° the open ring had seized the thin twine so that it cd be drawn out with force.

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Clematis flammula

Aug. 29th. Three inches of string put on peduncle of one of lateral terminal peduncle caused just perceive change in 14° —; in 24° the peduncle had moved curved backwards 90 degrees, the string lying in angle between it & main peduncle: in another hour or two was pressed tight.

I suspect thickness of string acts, more than weight, for in tying on strong a tail hang down, intertwined amidst peduncle of not very young leaf & in no part stra pulled straight with end hitched to branch but this flexuous but of loose twine happened to hang obliquely not nearly perpendicularly across a peduncle, & in 48° produced some effect; in 6 3 days the end of peduncle had doubled back nearly parallel to base. —

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Clematis flammula

I have now tried fragment of microscopical glass fixed on summit of it & cause peduncle to bend quick as opake stick.—

Six inches of cotton thread (standard weight) caused peduncle to bend certainly & discernibly in 48° probably before; but at this date certain

In 53° peduncle a semicircle; but subsequently no further movement if any change peduncle slightly straightened itself — This if minimum of excitement.

Aug 27th I took away sticks round which during 24° peduncle had wound, & now 31st they have not straightened themselves at all