Cuar. II. BIGNONIACE, 93 
excited to another: thus, when a stick was caught by 
the part immediately beneath the three toes, these 
seldom clasped it, but remained sticking straight out. 
The tendrils revolve spontaneously. The movement 
begins before the tendril is converted into a three- 
pronged grapnel by the divergence of the toes, and 
before any part has become sensitive; so that the 
revolving movement is useless at this early period. 
The movement is, also, now slow, two ellipses being 
completed conjointly in 24 hrs. 18 m. A mature ten- 
dril made an ellipse in 6 hrs.; so that it moved much 
more slowly than the internodes. The ellipses which 
were swept, both in a vertical and horizontal plane, 
were of large size. The petioles are not in the least 
sensitive, but revolve like the tendrils. We thus see 
that the young internodes, the petioles, and the ten- 
drils all continue revolving together, but at different 
rates. The movements of the tendrils which rise 
opposite one another are quite independent. Hence, 
when the whole shoot is allowed freely to revolve, 
nothing can be more intricate than the course followed 
by the extremity of each tendril. A wide space is 
thus irregularly searched for some object to be 
grasped. 
One other curious point remains to be mentioned. 
In the course of a few days after the toes have closely 
clasped a stick, their blunt extremities become de- 
veloped, though not invariably, into irregular disc- 
like balls which have the power of adhering firmly to 
the wood. As similiar cellular outgrowths will. be 
