Bui. 1156, U. S. Dept. of Agriculture 
Plate III, 
DC J2 
< 9 
LU 5 
o. - 
LU ~. 
O O 
CO = 
» 1 
-i -2 
uj ^ 
H -.-» 
< =3 
DC & 
UJ _- 
Q - 
O 3 
< .2 
> | 
o -S 
i- 
< c 
O - 
