350 NEW JERSEY AGRICULTURAL COLLEGE 



The decrease in the size of the roots between August 25tli and 

 October 12th, when S. B. 1 and 2 were actively growing all the 

 time, may perhaps be explained l)y an increased evaporation, 

 which followed the removal of the soil, and with it the breaking 

 of many smaller roots. Experiments will be continued to deter- 

 mine this. But the fact that the roots can increase in size when 

 in perfectly dry soil, as they did between October 12th and Oe^ 

 tober 20th, proves that rooted branches of the sweet potato may 

 under certain conditions help to increase the root crop of the main 

 plant. 



