OF A PARTIAL REMOVAL OF ROOTS, ETC. ö 



111 all eases, a certain number of plants were left intact to 

 serve as control. 



The plants used for my experiments were the following : 



Fisum arvense L. 



Pisum sativum var. arvense Poir. 



PharbiUs hederacea L. 



Vicia Faha L. var. equina Pcrs. 



Fagopyrum esculentum Moench. 



General Eesults. 



A. Effect of partial removal of vegetative organs. 



When the main root and most of the lateral roots were 

 removed, leaving few lateral roots untouched, flowering was pro- 

 moted (except in Fago'pyruni esculentum ; see Exp. I, 1, 4, 6). 



When all the lateral roots were successively removed, flower- 

 ing was prevented, and the leaves and stems became smaller than 

 in control (see Exp. I, 3). 



But when the removal was done once every four days, for 

 a month, and after that once every week, the growth of the 

 leaves and stems was not affected ; and the flowering was promoted 

 (see Exp. I, 5). 



By the removal of lateral roots once every week, for a month, 

 and once every two weeks during the second month, flowering 

 was advanced, but the total number of flowers was nearly the 

 same as in the control. 



The length of the stem also remained the same (see Exp. I, 7). 



It is clear that aii excessive removal of lateral roots prevents 



