454 BOTANICAL GAZETTE [DECEMBER 
A negative correlation occurs between percentage of sugar and 
average weight of root per row. The most marked occurrence of 
this kind is shown in the trends of figs. 44 and 45. Divergence 
is fully as evident, however, in more localized areas and even in 
r 
~ Se 
£ S % . Row. numbers 
95 -y 
SsS< SSSSSITBTS £§ 
/7 3000 iad "4 
16 2750 | oh? af 
5 2500 
4 2250) ows *° 
3 200 2a 
12 1750 [ ya 
M1 s09 biel bk) 
Fic. 41 nites of soil irregularities on Reo y between percentage of sugar 
and yield of sugar in consecutive progeny rows, Madison, 1913; solid line indicates 
yield of sugar iecud yield); broken Aig ieteans it of sugar. 
individual rows. Compare in this regard the divergence of graphs 
in rows 47, 72, 127, 157, and 162 of fig. 42, and 240-250, 255-265, 
and 370-380 of fig. 43. 
: a 
5538 Row numbers 
pEB SRST RTR TR BS 
epstaaness 
Pb it eat ae 
roo PSI Sabk AMSEC 
coo 40 $ f fh 
500 1/3 Pi it 
400 72 BABS 
1G. 42.—Effect of soil irregularities on relationship between percentage of sugar 
and ccteian weight of root in “ consecutive check rows, Madison, 1912; solid line 
indicates percentage of sugar; broken line, average weight of root per row. 
A high positive correlation is shown between average weight 
of root and yield of sugar per row in figs. 46-49. Whenever either 
graph progresses in a given direction, it is closely followed by the 
other member of the pair. This is most conspicuous in figs. 47 
and 48. 
