Chap. IIL BIGNONIACEiE. 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 intemodes. 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 intemodes, 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 iudependent. 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 



