Bui. 1270. U. S. Dept. of Agriculture 
Plate VI 
l±J ~ r? 
0- ? 2 
D •-§ 
cr =•- 
* Si 
f SI 
CM a 5 is 
2 — ^ 
§g° 
> o 3 
a. " 
O §_-.2 
O ^2 ~ 
CQ £<§> 
L_ » M — .^f 
Ll = 
