i08 



/ 



ESSAY 



INSECTS AND DISEASES 



Ilf JUEIOUS TO THE 



WHEAT CROPS. 



/ 





BY H. Y. HIND, ESQ., M.A., 



i3rofcS0or of CfjcmiBtra at SErinitg Collese, Toronto. 



TO WHICH WAS AWAEDED, BY THE BUREAU OF AGRICULTURE 

 AND STATISTICS, 



THE EIRST PRIZE. 



"The progress of agriculture ought to be one of the objects of your constant 

 care; for upon its improvement or decline depends the prosperity or decline of 

 empires."— (Speech of Napoleon III. 



TORONTO: 



PRINTED BY LOVELL & GIBSON, YONGE STREET. 

 1857. 



