HOW SOME PLANTS GET UP IN THE WORLD 103 



a mark along one side of it, from base to tip, 

 with indelible ink, and observe if the line be- 



PIG. 106. 

 Tendrils of cassabanana, a melon-like plant. 



comes twisted, or it' it is now seen on the con 

 cave side of the tendril and then on the con- 

 vex side. 



-i3-. The tendril finally strikes a support. 

 What then? It coils; but if it coils much, why 

 does it not twist in two, since both base and 

 tip are fixed ? (jStudy Fig. 106. At a the branches 

 of the tendril are searching for a support. At b 



