148 TENDRIL-BEARERS. Cuar. IV. 
week or two shrinks into the finest thread, withers and 
Ampelopsis hederacea. 
A. Tendril fully developed, with a young leaf on the opposite side of the stem. 
B. Older tendril, several weeks after its attachment to a wall, with the branches 
thickened and spirally contracted, and with the extremities developed into discs, 
The unattached branches of this tendril have withered and dropped off. 
drops off. An attached tendril, on the other hand, 
contracts spirally, and thus becomes highly elastic. so 
