Viii PREFACE. 



charge of the proof-reading; to Zeese-Wilkinson and Company, New 

 York City, for their care and skill in making the color-plates; and to the 

 J. B. Lyon Company, Albany, New York, for their careful work in the 

 mechanical construction of the book. 



U. P. HEDRICK, 

 Horticulturist, New York Agricultural Experiment Station. 



