[265]

Petunia violacea

A young leaf 3/4 of inch in length, rising from a height of 11 on stem of young plant, observed under skylight & traced on vertical glass

Apex of leaf 7 inches. from glass. The leaf at first [sketch]  inclined considerably upwards, & either from light now coming from above or from nocturnal manner of growth, steadily became more nearly horizontal. This effected by zig-zag movement (See tracing) which indicated circumnutation, & late on the 3d & during 4th & 5th this it was clearly seen that there was circumnutation on a small scale, but still accompanied by the downward movements.

[Movement in plants, p. 248: "Petunia violacea: downward movement and circumnutation of a very young leaf, traced from 10 A.M. June 2nd to 9.20 A.M. June 6th. N.B.—At 6.40 A.M. on the 5th it was necessary to move the pot a little, and a new tracing was begun at the point where two dots are not joined in the diagram. Apex of leaf 7 inches from the vertical glass. Temp. generally 17 1/2° C."]

[calculations not transcribed]