Cuar. IV. CUCURBITACE. 135 
pressed, during the revolving movement, against the 
projecting end of the shoot, would infallibly have 
seized it in a useless or injurious manner. But the 
main branch of the tendril, after revolving for a time 
in a vertical position, spontaneously bends downwards ; 
and in doing so, raises the spur-like branch, which 
itself also curves upwards; so that by these combined 
movements it rises above the projecting end of the 
shoot, and can now move freely without touching the 
shoot; and now it first becomes sensitive. 
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 
dises 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 
12 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. 
