[276]

Oct 19 Nankin cotton

Movement of cotyledons observed by fixing glass filament to one cotyledon the stem of this seedling being free. Dots made on a vertical glass by foreshortening the glass fibre The whole pot was covered a with a double cylinder of brown paper with paper lids. The cylinder was removed to make observations. The cotyledon under observation pointed from the light.

[annotated sketch and diagram] glass AD = 180mm AB = 17 AC =. 34

The amount of magnifying power will f vary with different positions, but it can never by less than 180/17 (say 10)

Oct 20 [Figure]

[277]

X As the bit of stalk above the collar was growing & bending slightly I thought it would put out the measurement of the angle, so I made a rough sketch of another seedling at night & in morning & it was clear that the cotyledons sunk at night so as to be almost horizontal & rose in the morning.

[278]

Nankin Cotton Oct 20

The seedling whose cotyledon was traced Oct 19 has now a collar of paper gummed round the stem below the cotyledons & this is f fastened to a peg. The angle of which the glass filament makes with horizon was then read. X