Chap. in. 



SMILACE^J. 



119 



side, they slowly bend to that side, and subsequently 

 become straight again. The back or convex side 

 when placed in contact with a stick became just per- 

 ceptibly curved in 1 hr. 20 m., but did not completely 



Pig. 7. 

 Smilax aspera. 



surround it until 48 hrs. had elapsed ; the concave side 

 of another became considerably curved in 2 hrs. and 

 clasped a stick in 5 hrs. As the pairs of tendrils grow 

 old, one tendril diverges more and more from the 

 other, and both slowly bend backwards and downwards, 

 so that after a time they project on the opposite side 



