48 



N. H. EXPERIMENT STATION 



[Bulletin 230 



s 



13 -Q 





-d 



c 

 0. 



O 



Si : 



e*2 



o 



1 '* 



1 " 



I 04 



I CO 



1^- 





± O 

 fell ^ 



— ' >- O 



^J 



.5 J 



I. C u 



u o c 







O 



Cm 





Sol 



£0- 



a.2 







2S 



^ U "o 





(A;Z 



s_ss 



tst. 



72 



2 = ^ 





c ;;; 



» c 

 .E — " 

 '^ '^ .E 



