Bui. 1450, U. S. Dept. of Agriculture 
Plate 6 
- c 
* 4 
a §§ 
3 .53 3 
3.2 
°-3 
2 S 
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£ 3.3 o<= £ 2 
tr .as *-' __ "3 w i£ 
3 .5"S o ts 2 
« § > S &£ M 
5 as 
O h.+? m = <S O 
&2 
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