98 



LSSSONS WITS PLANTS 



Pig. 94. 

 Normal leaf of cobea. 



single pair of leaf- 

 lets, but each leaflet 

 is curiously lobed, 

 and tendrils are spring- 

 ing from the end. We 

 are now convinced that 

 tendrils may be modi- 

 fied parts of leaves. 

 108. This leaf in 

 Fig. 95 is interest- 

 ing, because it shows 

 also a variation or 

 change which is 

 foreign to the normal type or tendency of the 

 leaf. That is, we know that the terminal leaf- 

 let in the cobea is 

 a tendrU ; if other 

 tendrils appear, we 

 should expect them to 

 arise from the complete 

 transformation of one 

 of the lateral leaf- 

 lets. Instead of 

 this normal behav- 

 ior, however, the 

 lateral leaflets have 

 become strangely Pie 95 



shaped, and tendrils Monstrous leaf of cobea. 



