M.
July 22, 1st circle was made in 8 0 (rather young shoot)
23, 2nd 7 15
24, 3rd 5 0 (about)
In the foregoing Table, which includes twining plants belonging to
widely different orders, we see that the rate at which growth travels
or circulates round the axis (on which the revolving movement
depends), differs much. As long as a plant remains under the same
conditions, the rate is often remarkably uniform, as with the Hop,
Mikania, Phaseolus, &c. The Scyphanthus made one revolution in 1 hr.
17 m., and this is the quickest rate observed by me; but we shall
hereafter see a tendril-bearing Passiflora revolving more rapidly. A
shoot of the Akebia quinata made a revolution in 1 hr. 30 m., and
three revolutions at the average rate of 1 hr. 38 m.; a Convolvulus
made two revolutions at the average of 1 hr. 42 m., and Phaseolus
vulgaris three at the average of 1 hr. 57 m. On the other hand, some
plants take 24 hrs. for a single revolution, and the Adhadota
sometimes required 48 hrs.; yet this latter plant is an efficient
twiner. Species of the same genus move at different rates.
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