4 inch in length; and the
movements of one of them were traced during 48 h. (see Fig. 101). The
course pursued is closely analogous to that of the whole leaf. The zigzag
line between 8.30 A.M. and 3.30 P.M. on the second day represents 5 very
small ellipses, with their
Fig 101. Vicia faba: circumnutation of one of the two terminal leaflets,
the main petiole having been secured, traced from 10.40 A.M. July 4th to
10.30 A.M. 6th. Apex of leaflet 6 5/8 inches from the vertical glass.
Tracing here reduced to one-half of original scale. Temp. 16o - 18o C.
longer axes differently directed. From these observations it follows that
both the whole leaf and the terminal leaflets undergo a well-marked daily
periodical movement, rising in the evening and falling during the latter
part of the night or early morning; whilst in the middle of the day they
generally circumnutate round the same small space.
[page 236]
(10.) Acacia retinoides (Leguminosae).--The movement of a young phyllode, 2
3/8 inches in length, and inclined at a considerable angle above the
horizon, was traced during 45 h.
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