1916] PRITCHARD—SUGAR-BEET BREEDING 457 
negatively correlated with average weight of root. Both yield 
and percentage, therefore, should be considered in making selec- 
tions. Obviously, the best single character is yield of extractable 
. Se 
se 
Ae 
. 8 &= 
ea 
35 gs Row numbers 
ao 6. So 2 
pono RESSRSSSSRS Sss RSSESFSE 
' 6000 so00 Lo 
0 309 fe a ey ry " 
¥ a 
4000 8001 ba, eee P| le fear see” La! 
3000 70 p } Oe ed we a tat wei ‘. 
2000 § al TMalt | VAR. 
1000 §, V , me Gu by 
Fic. 47.—Effect of soil irregularities on been 346 between average root weight 
and yield of sugar in consecutive check rows, Madison, 1912; solid line indicates 
average weight of root per row; broken ti, yield of sugar. 
sugar, but even with its use a lower limit should be set for per- 
centage. The extra cost of determining coefficients of purity used 
in calculating extractable sugar, however, would probably condemn 
the use of this method for commercial purposes. 
Sok 
Sas 
BSS Row numbers 
x > 
= 
+00 PERISSSS SES TS SESS SSERE 
3000 $0 
000 44 % RS 
4000 
tJ ¥ a, a 
° sO ll 
Fic. 48.—Effect of soil irregularities on relationship between average root weight 
and ary of sugar in consecutive check rows, Madison, 1913; solid line indicates 
average weight of root per row; broken line, yield of sugar. 
Discussion of results 
The results of the foregoing experiments may appear, at first 
Sight, to disprove the possibilities of beet improvement, but this 
is only apparent. The fact of past improvement is beyond 
