Bui. 299, U. S. Dept of Agricultur 
Plate IX. 
ti 
bo* 
ll 
So 
as 
■S-S 
05 ho 
ss 
5 bo 
d cd 
si 
B-2 
m Q o 
S. 03 CO 
SCO 
3'~ ft 
£t> 
