Bui. 1118, U. S. Dept. of Agriculture. 
Plate I. 
z ■_; 
I %6 
UJ go 
-I ~~ 
1 II 
< -J- 
o ^ g 
z - ^ 
< 2g 
0: -=_- 
O ci 
< Vz 
2 3 3 
co — = 
H- ^o 
< .= 
CO -•? 
H §" = 
D P a 
DC - •-■ 
Q. > j- 
< Sft 
DC - ■{- 
(J 2* 
U. : = 
° !>> 
to — — 
111 fld 
I • - % 
\- ?:= 
Z T 12 
O S.=S 
CO -=' 
co = 2 
D o o 
- B<t3" 
H ■- = 
O Z' 
- - 
— a 
III 
