Parts I, II. Ill, 



/4*t^r>^C-^& ' 

 Price, 50 cents a Part, 



A GUIDE 



THE STUDY OF INSECTS, 



AND A TREATISE ON THOSE 



INJURIOUS AND BENEFICIAL TO CROPS. 



KOlt THE USE OF COLLEGES, FARM-SCHOOLS, AND AGKICULTU) 



A. S. PACKARD, Jit., M. D. 



WITH UPWARDS OF FIVE HUNDRED ENGRAVINGS. 



THK IIKSSI AN V\.\ AM> IT> ^ 



SA I, KM : 



I* 11 K S S O F T II 10 10 S S 10 X I N S T I 'I 1 T ] 



1868. 



