40 



BULLETIN 948, U. S. DEPARTMENT OF AGRICULTURE. 



O 



"8 



s 



1/1 



y, 



z 



< 



< 



en 



Yl 



W 







a 



H 



< 



fe 



' J. 



03 I 

 is I 



ii 



O (I) 



CMi-l 



com 



oj a t. t» 



I :i 



2 &« & 9 



Pi OJ 



