PLATE III. 
Bul. 856, U. S. Dept. of Agriculture. 
SS Sr TS SE A ———E—_——————— 
— SS a Ep a EE EE 
mr 
5 a 
wo 
wu & 
ao «4 
2 3 
Ors 
4 5 
See 
<p 
Zz Ss 
<q q 
Oo + 
Lo 
o 
O 4 
(ems 
TS 
Ap 
3 2 
O28 
= 
