[131]

Feb 1st Nut Corylus

Saw small crack in sand & by removing earth found plumule arched, like U inverted, with summit of arc just beneath level of ground; fixed glass filament to near base of basal half

[sketch] filament or bristle —nut

& traced on horizontal glass, the seedling illuminated from vertically above by looking glass— Plumule kept damp by being surrounded by small vessel with glass cover.

First dot 8º 34'. last dot 10º 36' P.m same day. The upper part of plumule began at once to rise & by next morning at 8º-30' was alm 45º above horizon. at right angles to lower part. What is important is that basal half straightened itself & even bent a little backwards from the upper part, so that the line traced was in most parts straight, but in other parts was decidedly zig-zag showing that some nutation in during this movement.

Feb. 2d. took at a another spec. of which the upper half of plumule on stem stood at about 45º above horizon, & the uppermost part or apex projected .4 of inch above ground, & fixed horizontally glass filament on uppermost straight part of lower half of plumule beneath lowest scale-like leaves & traced on horizonal glass, with light from above, & only occasionally. First dot 8º. 55' (over)

[131v]

(Nut)

At end of observation at 8º a.m. Feb. 4th. the plumule was much straighter & tip .85 of inch above ground, & filament fixed .35 above ground, owing to growth of lower part. See tracing magnified 27 times, as filament fixed transversely, this is about real degree of magnification, & the middle of stem, (excluding last great movement late on Feb. 3d) must have moved about .04 or 4/100 of inch from side to side. Plumule thoroughly well protected by lateral light: See tracing. The great movement between 9º 40 & 10º 40' P.m on Feb 3d probably due to the straightening of upper part of plumule, which affected immediately adjoining lower part. Dotted lines course during night. There can I think be no doubt that plumule circumnutates ie does not grow up by equal growth all round stem, but by successive growths on different sides.