Nebraska Agricultural Exp. Station, Research Bui. 6. 
ss 
o 
•Is 
00 
to 
Q 
o < 
t-» s 
CO 
^£ 
O »h 
o 
5S5 
to 
<S> '<S> 
CO 
s 
< 
u - c 
s ^ ° 
? ft D O S 
h a+-> 
C-l -!-> CO 
^ w CO CM CM CM CM CM 
cc «5 CO CO CM © 
-2 oo CO t-' OS C> CM 
^Ci-U5 0 05rHOrH 
i 10 oi o> cm 
t> CM t> U5 «5 t> 
' ^in co in lo in in 
o 
g ^<M CM lO CM CM CO 
eeocM-^oic^i>i> 
Jk CO CM CO »-H -t 
O 1-H CO CO 
g C S 
m *= rt 
ill 
so co in in m m co 
g ^<M ^ CO CM t> rH 
e cm oi co" in in to co 
Jfc Ol CO CO iH CM 
O r-I^HCMCMcM 
so CM o m o o o 
g HCOOiflN 
O ,-li-ICMCMcM 
OHOHOH 
CP CD 
o o rt cs. 
11 g g^^ 
eg a> cu cu -£ -£ 
T3 
<X> 
be 
a 
> 
0) 
SPG 
cu p— < 
So 
"53 M • 
a> _ 
.S3- 1 fl 
,J3 Sh c3 
O a) cp 
3 tl bS 
fc; a» 
. bo > 
