EXPERIMENT STATION REPORT. 



551 



o 



a 



c 

 o 



u 



C5 



IB 



cu * 



00 a, 



t^ rt N 



O O 00 



00 O 00 o 



t^ -H -I 



00 t~ t» 



Tj< t- t-< 



00 t~ t^ 



O 00 •* 

 to tn t~ 



^ o »- 



s. 



ig a 



Pi a 



