ACKNOWLEDGMENTS 



Much valuable data has been furnished by the horticultural 

 departments of the various states, and especially by Mr. G. B. 

 Hussman, Chief Viticulturist of the United States Department 

 of Agriculture, and Mr. Morrell, Agriculturist for the Southern 

 Railroad System. Mr. Antoine Wintzer, of the Conard-Jones 

 Rose Company, West Grove, Pennsylvania, and Mr. G. B. 

 Starcher, of Auburn, Alabama, should be especially mentioned 

 for valuable assistance rendered in collecting cuttings and making 

 observations. 



