iv PREFACE. 



phia Press, New York Tribune, Prairie Farmer, the Clover 

 Leaf, also using my reports as printed in the Michigan Board 

 of Agriculture. Liberal quotations have been made from the 

 publications of Baron J. B. Lawes, Charles Darwin, Maxwell 

 T. Masters, George Bentham, Wm. Caruthers, Prof. James 

 Buckman, Dr. A. Voelcker, of England; M. J. Duval-Jouve, 

 of France; Ernest Hackel, of Germany; J. S. Gould, C. W. 

 Howard, Dr. D. L. Phares, Joseph Harris and J. B. Kille- 

 brew, of our own country. 



My colleague, Prof. A. J. Cook, contributed the long and 

 valuable chapter on Insects Injurious to Grasses and Clovers, 

 while Prof. William Trelease, D. Sc., contributed that on 

 Fungi injurious to the same orders of plants. 



My friend, Prof. F. Lamson Scribner, has shown much 

 interest in the work, and to him I am especially indebted for 

 many of the excellent drawings of grasses. Mr. G. B. Sud- 

 worth also made many drawings and copied others. 



The Levytype Company, of Philadelphia, and the Lewis 

 Engraving Company, of Boston, prepared most of the plates 

 from the drawings illustrating the work. 



Frequent quotations have been made from the Rural New 

 Yorker, Country Gentleman, New York Tribune, Prairie Far- 

 mer, Farmers' Review, and many agricultural reports of this 

 country and of Europe. 



The following persons also prepared more or less manu- 

 script for these pages, and credit is given on the pages where 

 the contributions appear: Prof. E. M. Shelton, of Kansas; 

 Dr. H. P. Armsby, of Wisconsin; Prof. C. G. Pringle, of 

 Vermont ; Dr. C. E. Bessey, of Nebraska ; Prof. J. J. Thomas, 

 Major H. E. Alvord, Prof. I. P. Roberts, Dr. E. L. Sturte- 

 vant and J. S. Woodward, of New York; A. W. Cheever, of 

 Massachusetts ; Prof. J. W. Sanborn, of Missouri ; Prof. F. 



