ACKNOWLEDaElOa^IT 



The present monograph is the outcome of one year's study 

 in the Department of Horticulture of the College of Agriculture 

 of Cornell University, I be ^^ leave to acknowledge loy indebt- 

 edness to Professor John Craig who not only suggested to me 

 the idea of devoting my time to the studies of the fruits of 

 my country but also gave me kind guidance and wise advice from 

 time to time during the pursuit of my studies. 



