Cuar, JID. POLEMONIACE. 107 
the internodes revolve; so that here we have the tendril 
alone moving. On the other hand, with most of the 
species of Bignonia and the Eccremocarpus, the inter- 
nodes, tendrils, and petioles all revolved. The long, 
straight, tapering main stem of the tendril of the Cobaa 
bears alternate branches; and each branch is several 
times divided, with the finer branches as thin as very 
thin bristles and extremely flexible, so that they are 
blown about by a breath of air; yet they are strong 
and highly elastic. The extremity of each branch is a 
little flattened, and terminates in a minute double 
(though sometimes single) hook, formed ofa hard, trans- 
lucent, woody substance, and as sharp as the finest 
needle. On a tendril which was eleven inches long I 
counted ninety-four of these beautifully constructed 
little hooks. They readily catch soft wood, or gloves, 
or the skin of the naked hand. With the exception of 
these hardened hooks, and of the basal part of the central 
stem, every part of every branchlet is highly sensitive 
on all sides to a slight touch, and bends in a few 
minutes towards the touched side. By lightly rub- 
bing several sub-branches on opposite sides, the whole 
tendril rapidly assumed an extraordinarily crooked 
shape. These movements from contact do not inter- 
fere with the ordinary revolving movement. The 
branches, after becoming greatly curved from being 
touched, straighten themselves at a quicker rate than 
in almost any other tendril seen by me, namely, in 
between half an hour and an hour. After the tendril 
has caught any object, spiral contraction likewise 
