INTBODDCTION XVll 



attempted. Professor C. F. Wheeler, of the same insti- 

 tution, has aided the artist at every point, and has 

 attended to the selection of much of the material for 

 the illustrations. He has also read all the proofs, and 

 has taken the most helpful interest in the progress of 

 the work. The proofs have also been read by Professor 

 W. F. Ganong, of Smith College, Northampton, Massa- 

 chusetts, whose cooperation was solicited in order that 

 the book should not contradict recent studies in mor- 

 phology. He has given most generous assistance, and 

 has added greatly to any merit which the book may 

 possess, but, in justice to him, the author must state 

 that it has been impossible to incorporate all the useful 

 suggestions and criticisms which he has made. 



The author will be glad of any suggestions upon the 

 matter or the method of the book. 



L. H. BAILEY. 



HORTICULTTJEAL DEPARTMENT, CORNELL UNIVERSITY. 



Ithaca, New York, November 1, 1897. 



