40 



BULLETIN 832, U. S. DEPARTMENT OF AGRICULTURE. 



QQ 



- ' 

















^V\ 



&A 











^|>V 



>~ 













v v^. 

























%= 













Vw 













\^ 

























fe 















(XL 













Id 

 > 



>- 



o 



as 











Ji 



o 











. _: 



































- 















































^ /; 













S*' 











^ 









j£< 



<vp? 



J 











*— j" — ► 





