[F12r]

Mimosa albida & marginata

523

(The circumnutation of the main petiole of a fine young leaf was traced during 2 3/4 days, & was seen considerable in extent, but less complicated than with that of M. pudica.

The movement was much more lateral than is usual with circumnutating leaves & this was the sole peculiarity presented. The extent to which the petiole rose l each night, during the three when it was observed differed much. The apex of a terminal leaflet on a free leaf was seen t under the microscope to travel 1/50 of inch in 3 minutes.

Mimosa marginata: The opposite leaflets rise up & approach each other at night, but do not come into close contact, excepting young ones leaflets on vigorous shoots. Full-grown leaflets circumnutate during the day on a small scale & slowly.

Schrankia uncinata: leaves with 2 or 3 pairs of pinnæ each of which bears many small leaflets. These, when the plant is asleep are directed forwards & become imbricated.

The two terminal pinnæ converge, in the one case measured when a measurement was made.

[Movement in plants, p. 381: "he circumnutation of the main petiole of a young leaf was traced during 2 3/4 days, and was considerable in extent, but less complex than that of M. pudica. The movement was much more lateral than is usual with circumnutating leaves, and this was the sole peculiarity which it presented. The apex of one of the terminal leaflets was seen under the microscope to travel 1/50 of an inch in 3 minutes.
Mimosa marginata.—The opposite leaflets rise up and approach each other at night, but do not come into close contact, except in the case of very young leaflets on vigorous shoots. Full-grown leaflets circumnutate during the day slowly and on a small scale.
Schrankia uncinata (Tribe 20).—A leaf consists of two or three pairs of pinnae, each bearing many small leaflets. These, when the plant is asleep, are directed forwards and become imbricated. The angle between the two terminal pinnae was diminished at night, in one case by 15°; and they sank almost vertically downwards."]

[F12v]

[Part of CUL-DAR52.F12]