22 
BULLETIN 520, U. S. DEPARTMENT OF AGRICULTURE. 
a 
C 
X G 
o 
w 
i 
o 
Q 
o 
■r 
GO 
- 
R 
£2 "7T C ' ^ X — 
b : -2 s 2 > - " 
2 -^ - ^.-ls 
c ■ -^ £ 3 = r= x 
« r ■ ~£p - 
d ■ o • ,-£•—" 
C ' r - — < K c3 C "7 
ft x— o3 
X y ~ 
x a ^ 
2^ 
to 
H ^ 
X jr 
"5 " 
. O 
•-d 
• © 
I * 
— X 
X _ — 
I ai 
8 a 
I < 
llll'l 
fllflj 
•= PI B S ~" 
O o3' 
cs ~ 
w 5 
B - 
sllsl^ 
m 
- 
_5 o 
r 
- 
. , . 
'% : 
- 
- 
d ! 
— 
- 
o . 
._ 
> 

~ 
o ' 
- 
od 
u 
= 2 a m o 
— — — -. 
dSQQ — 
* I ffl 
< ft 
C 
H 
•notaipaoj 
jo q^guaq; 
•ap^o 
•iq2T9Ai 
i 1 
■*„* | ( 
-tnnu §bx 
1 
■uoijipnoj 
•eidBis 
jo q^§n9T; j 
•&QB1Q 
•jq3]3AV 
■shjbk 
•jaq 
-uinu sex | 
3 ^ 
S 93 
55 =£ 
~ ft 
. O 
x 
X £ 
si 
Z - 
o 2 
B & 
a? 
•— x U 
