452 



NELLIE M. PAYNE. 



-32 



-28 



-24 



-20 



I 



RELATION BETWEEN CON- 

 DUCTIVITY AND COLD 

 HARDINESS 



D Popillia japonica 

 x Dracrisio virgmica 

 A Dendroides canadensis 







Z 3 .4- .5 6 7 .8 



CONDUCTIVITY IN /o NACL EQUIVALEMT 



FIG. 3. Relation between conductivity and cold hardiness. Popillia japonica 

 , Diacrisia virginica X, Dendroides canadensis A. 



