

GUIDE 



TO 



THE STUDY OF INSECTS 



AND A TREATISE ON THOSE 



INJURIOUS AND BENEFICIAL TO CROPS 



FOR THE USE OF 



COLLEGES, FARM-SCHOOLS, AND AGRICULTURISTS 



BY 



A. S. PACKARD, JR., M.D. 



WITH FIFTEEN PLATES AND SIX HUNDRED AND SEVENTY WOOD-CUTS 



SIXTH EDITION 



NEW YORK 

 HENRY HOLT AND COMPANY 



BOSTON: ESTES & LAURIAT 

 1878 



