1916] PRITCHARD—SUGAR-BEET BREEDING 453 
conditions, however, and as this may cause a deviation from the 
theoretical relationships, the actual relationships have been deter- 
mined by, plotting in figs. 37-50 the mean values of consecutive rows 
containing 80-100 per cent stand. 
» 
SKSe 
i 
ssoc Frow numbers 
Shc ae’ 
wass > } Seseee_eseqe so Sos 9 8 a) 
tre MES SRSEKSSHRRERSKRSERE SE 
44 €00 bd Ee Pe a LT | a mip 
~, e he . at ’ 1 @ii se . 
3 5000; i" * te Me i 12 J 
/2 $000 + : 4 ; 
S's bi 7 
4 3000 
4 3000s | bo Peb get 
Fic. 39.—Effect of soil ce on relationship between percentage of sugar 
and yield of sugar in progeny rows, Madison, ots solid line indicates yield of sugar 
(corrected yield); broken ee Gece of su 
Figs. 37-41 show no correlation between percentage of sugar 
and yield of sugar in beet rows. In some places the graphs seem 
to follow a similar trend, as in rows 390-460 and 600-630 of fig. 38, 
e x 
= ry SE Row numbers 
s2v 
sts. <s 
S~BESSSSSSSHESSSSESFESSESES 
15 7000 rt nail il. [ 
{4 6000 2. ah Ob, | 2i2. sy ‘<a A * 1 a 
13 5000 Sn K S Pl | sete | aa! ee Ra Pls 
/2 4000 a, . vy ya ey e 
4 3000__| 
10 “i ra 
37 it 
Fic. 40.—Effect of soil irregularities on relationship between percentage of sugar 
and yield of sugar in progeny rows, Madison, 1912; solid line indicates yield of sugar 
(corrected yield); broken line, percentage of sugar. 
and 370-440 of fig. 40; but in other places, as in rows 100-160 of 
fig. 37 and 450-520 of fig. 41, they apparently diverge. On the 
average, therefore, percentage and yield vary independently. 
