The tips of both branches, when they come into contact with a stick, grasp it like any ordinary tendril. But in the course of a few days, the lower surface swells and becomes developed into a cellular layer, which adapts itself closely to the wood, and firmly adheres to it. This layer is analogous to the adhesive discs formed by the extremities of the tendrils of some species of _Bignonia_ and of _Ampelopsis_; but in the _Hanburya_ the layer is developed along the terminal inner surface, sometimes for a length of 1¾ inches, and not at the extreme tip. The layer is white, whilst the tendril is green, and near the tip it is sometimes thicker than the tendril itself; it generally spreads a little beyond the sides of the tendril, and is fringed with free elongated cells, which have enlarged globular or retort-shaped heads. This cellular layer apparently secretes some resinous cement; for its adhesion to the wood was not lessened by an immersion of 24 hrs. in alcohol or water, but was quite loosened by a similar immersion in ether or turpentine. After a tendril has once firmly coiled itself round a stick, it is difficult to imagine of what use the adhesive cellular layer can be. Owing to the spiral contraction which soon ensues, the tendrils were never able to remain, excepting in one instance, in contact with a thick post or a nearly flat surface; if they had quickly become attached by means of the adhesive layer, this would evidently have been of service to the plant. The tendrils of _Bryonia dioica_, _Cucurbita ovifera_, and _Cucumis sativa_ are sensitive and revolve. Whether the internodes likewise revolve I did not observe. In _Anguria Warscewiczii_, the internodes, though thick and stiff, revolve: in this plant the lower surface of the tendril, some time after clasping a stick, produces a coarsely cellular layer or cushion, which adapts itself closely to the wood, like that formed by the tendril of the _Hanburya_; but it is not in the least adhesive. In _Zanonia Indica_, which belongs to a different tribe of the family, the forked tendrils and the internodes revolve in periods between 2 hrs. 8 m. and 3 hrs. 35 m., moving against the sun. VITACEÆ.—In this family and in the two following, namely, the Sapindacæ and Passifloraceæ, the tendrils are modified flower-peduncles; and are therefore axial in their nature. In this respect they differ from all those previously described, with the exception, perhaps, of the Cucurbitaceæ. The homological nature, however, of a tendril seems to make no difference in its action. [Picture: Fig. 9. Tendril of the Vine. A. Peduncle of tendril. B. Longer Branch, with a scale at its base. C. Shorter branch. D. Petiole of the opposite leaf]