4 AKT. 4. M. SHIGA : ON THE EFFECT 



blossoming, while the removal of a proper number is favourable 

 to flowering. 



In all my experiments, when lateral roots were removed, 

 the main root became very long ; while the stem was shorter than 

 in the control. 



When the main root was removed, leaving a few lateral 

 roots, the stems were not affected. 



In Pharbitis, when the sprouts were removed continually, 

 the size of both flowers and leaves increased (see Exp. II, 1). 



In Pisum, when the full grown leaves were removed con- 

 tinually, leaving only the bracts, flowering was prevented and 

 the stems became shorter than in the control. 



In Pharbitis and Fagopyrwn, a continual removal of leaves 

 stops the growth of the whole plant. 



B. Differences by species. 



In Pharbitis hederacea, Pisum arvense and Vicia Faba, the 

 removal of the main root and some of the lateral roots, leaving 

 only a few lateral roots, caused flowers to appear earlier than 

 usual and abundant flowers were produced, but this was not the 

 case with Fagoj^yrum esculentum. 



When all the lateral roots were removed, Pisum arvense was 

 too much injured to blossom earlier than usual, while in Vicia 

 Faba and Pisum sativum var. arvense blossoming was promoted. 



In PisiDii arvense, flowering was not promoted by a con- 

 tinual removal of the leaves, and Pharbitis hederacea and Fago- 

 pyrum esculentum did not flower on the removal of tlie foliar 

 organs. In Pisum, the bracts seem to serve as assimilatory organs, 

 whereas Pharbitis and Fagopyrum have no such advantage. 



