viii Preface 



plants to the better understood physiology of the plants 

 themselves. The older and traditional opinions and 

 notions are gradually giving way to the results of careful 

 investigation. 



In this edition I have had the great advantage of the 

 advice of many persons. I have freely incorporated the 

 work of others, as appears in the text. Particularly am I 

 indebted to Prof. C. S. Wilson and Prof. W. H. Chandler, 

 of the Department of Pomology in the New York State 

 College of Agriculture at Cornell University. The one 

 has read all the proof in galleys and the other has read it 

 all in pages. They have helped me over many doubtful 

 places, and have thereby made the book more worth the 



while. 



L. H. BAILEY. 



ITHACA, N. Y., December 25, 1914. 



