Bui. 1346, U. S. Dept. of Agriculture 
Plate VI 
Q I 
<A | 
s i 
u. c 
LU 2 
> =3 
< £ 
* I 
z .S 
o 
m a 
Q- 3 
O M 
- 1 s 
z § 
< 5 
