Vlll PREFACE 



Hall, who has had charge of the proof reading; to Zeese-Wilkinson Com- 

 pany, New York City, who have had an especially difficult task in making 

 the color-plates and who have done the work well; and to the J. B. Lyon 

 Company, Albany, New York, for their painstaking work in printing the 



book. 



U. P. HEDRICK, 



Horticulturist, New York Agricultural Experiment Station. 



