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. The rate does not seem governed by the thickness of the shoots: those of the _Sollya_ are as thin and flexible as string, but move more slowly than the thick and fleshy shoots of the _Ruscus_, which seem little fitted for movement of any kind. The shoots of the _Wistaria_, which become woody, move faster than those of the herbaceous _Ipomoea_ or _Thunbergia_. We know that the internodes, whilst still very young, do not acquire their proper rate of movement; hence the several shoots on the same plant may sometimes be seen revolving at different rates. The two or three, or even more, internodes which are first formed above the cotyledons, or above the root-stock of a perennial plant, do not move; they can support themselves, and nothing superfluous is granted.