[112]

Cauliflower 1877

Used

Octr 15. Long glass filament fixed to stem (free) not touching cots.; no true leaves — Traced on Horizonal glass Plant had been for 2 days on same position relatively to light

From 8° 55 to 11° moved to light, zig-zagging —

After 12° 50' from light with same zig-zagging —

At 4° 33 filament was touched accidentally & new dot made at 4° 46— zig-zagged from light till 10° 15'— During night, moved a little in direction of light. see Diagram (1) —

(Oct 16th First dot at 6° 45' moved to light to 8° when new tracing begun; (2.) plant in same position.— (Perhaps filament of glass gummed along stem interfere with nutation). The zigzagging between 11° 35 & 3. 37 coincident with day becoming very dark. N.B The distance of dots in evening is chiefly due to my having the glass, & the view was thus more oblique. There certainly seems nutation, but all is doubtful from action of light: when light ceases there may be tension & going back, but this is hardly credible. It is clear that Brassica moves towards light during day & some way back during night where Avena moved only to light.—

Day varied in light