GUIDE 



TO 



THE STUDY OF INSECTS 



AND A TREATISE ON THOSE 



INJURIOUS AND BENEFICIAL TO OEOPS 



FOR THE USE OF 



COLLEGES, FARM-SCHOOLS, AND AGRICULTURISTS 



BY 



ALPHETJS S. PACKARD, M.D. 



WITH FIFTEEN PLATES AND SIX HUNDRED AND SEVENTY WOOD-CUTS. 



NINTH EDITION. 



NEW YORK 

 HENRY HOLT AND COMPANY 



BOSTON I ESTES & LAURIAT 

 1889. 



