Read it through once

Certain Virginian Creepers and Vines behave in quite a different manner. The tendrils grow away from the light and so seek the shadow of the leaves. They are also divided into little branches. At the tip of each little branch is a small knob; if this should touch the wall or the trunk of a tree, etc., it immediately secretes a drop of cement and glues itself firmly to the wall. There is a curious difference in different sorts of _Ampelopsis_ in this respect. There is no adhesive pad in one of them (_Ampelopsis hederacea_) until it touches, whilst _A. Veitchii_ has them more or less ready for gluing before they touch (though they become much larger and better developed as soon as they rub against the wall).[141]