62 Nebraska Agricultural Exp. Station, Research Bui. 13 
O 2? 
so 
_ CO 
O CO 
I 
CO I 
w I; 
< 
-^3 C 
0) C 
> > 
|j c£5 lo cb i;d CO OS 
ooqcooO'^(Moocc) 
►J 
PQ 
H CO T-H i-H 00 rH to iq 
^ 00 00 00 0500 00 00 00 
I I ! I I I I I 
^ '^t>-'^ooqt>;oqt-; 
J oo^oit-^O'^aicrj 
O 
< 
W 
H 
GO 
Pi. 
O 
Q 
CO 
O 
^DC-OiOOOOO 
OiCOC^i-HOOi-HTil'^ 
oooooot-oooot-t- 
tOiOuOlOUOUOUOlO 
(M<MC<I(M(M(N(M<M 
CO CO ^ 
(M CT> 
(M OJ 00 
OO t- CO 
-M (M (M CO 
I I 
"i^ IfS T— I 
^ OS CO 
^ o t-^ 
00 00 tr- 
io UO lO 
(M CM (M (M 
CD CO 
CO o 
^' ^ 
00 00 
I I 
o 
CO CO 
00 ! 00 
<1 
