EXPERIMENT STATION BULLETINS. 



277 



+ 2 



r o 



+ " 



. C3 



ro CJ ra 

 O t- 2 



m O D, 



OJ _^ CJ 



o so CJ 

 -5 tiD CJ 



'"' S ai 



GO 



g:s.s 



■-»^ o_ 



CJ "^ o 



C^io 



S ° " 

 -S c.SP 



ca'-cLi 

 .H-a I 

 -o^ I 



