EXPERIMENT STATION BULLETINS. 



843 



y 



c 



o 

 a 



C3 



o 



o 

 o 



c 

 o 



o o 



3 _ 



CB.2 



•a S 



J2 TO 



5 0) 



s ^ 



o ^ 



O CO 



c 

 o 

 o 



x: 



o 



3 

 O 



