4 8 



BOTAXICAL GAZETTE 



[JANUARY 



also that the roots form more slowly in a leafless stem than in a 

 stem with leaves. We find also that in a general way the 



> 



v 



w 



*&r*. 





^^^m 



Fig. 30 



amount of curvature and the amount of root formation vary in 

 the same sense. 



