'.-, 



3 

 GUIDE 



TO 



THE STUDY OF INSECTS, 



AND A TREATISE ON THOSE 



INJUEIOUS AND BENEFICIAL TO CROPS: 



FOR THE USE OF 



COLLEGES, FARM-SCHOOLS, AND AGRICULTURISTS. 



BY 



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



\V1TH FIFTEEN PLATES AND SIX HUNDRED AND SEVENTY WOOD-CUTS. 





THIRD EDITION. 



SALEM : 





NATURALISTS' AGENCY. 



LONDON : TJJUBNER & CO. 

 TASSEL: THEODOR FISCHER. 



1872. 



