[73]

Aug 21. 1863

Passiflora punctata.—

A leaf, about 3/4 grown & tendril half-grown, borne on an internode 1 inch long, & surmounted by small drooping internode. The internode & leaf did not move in least — but the tendril which drooped down in a curve in its whole circular course; travelled 1' circle in 3°. 5'— a second circle in 2°. 40'

On Augt 22d a third circle in 2. 50'.

The first semicircle from light was performed in 1°. 40' — The send € towards light in 1°. 25' ie in 15' quicker — Second time The first semicircle in 1°. 30; the second semic. towards light in 1°. 10', ie 20' quicker. —

A most delicate touch with pencil on concave side soon caused great curvature; but none, when tendril was drooping

I put on loop of 3 inches of cotton, (as before)

[73v]

Reverse of Watch

Tip straightens itself again

Though so sensitive, movement not very rapid no conspicuous result until 5' or 10'.—

One inch of cotton produced no plain or certain result─

[73b]

& it slided off. I repeated this tw thrice, & this friction caused movement. — So did the 3 inch loop when hung on extreme curled apex. ie (I think 7/100 yes of grain? 1/14 of a gr). This loop having on convex side near base produced no effect. The curling of tip reversed to stop revolving movement. —

When tendril was revolving, with convex side of point forwards, I put stick in path, it rose like a creeper; & so passed stick but did not at all clasp stick; I then touched concave side with pencil & immediately curled. — This shows great difference in sensibility of the two sides.

Aug. 23d I to rubbed with stick repeatedly convex side of tip of tendril no effect— two slight rubs on concave side made a circle.—