456 BOTANICAL GAZETTE [DECEMBER 
The relationships exhibited in the foregoing figures between 
yield and quality of beet rows have a very important bearing upon 
sugar-beet improvement. Selection for yield of sugar regardless 
Row num bers 
tin 
rcen 
/0 
20} 20 
3 
50 
60 
70 
80 
90 
/00 
/0 
/20 
2 
/40 
/50 
/60 
-=— 
a 
fe) 
500 15? | Dgoe Ol! | ids 
! fe) 
300 ite Pell afer iS Py Pp 
200 12 aes 
IG. 45.—Effect of soil irregularities on apres between percentage of sugar 
and average weight of root in consecutive check rows, Madison, 1914; solid line 
indicates percentage of sugar; broken nit average weight of root per row. 
= 
2 SE Row numbers 
& ec 
Ss 
mat Bo ss 8 S © 6 Ss > © o's © 6 
Re ee ees 
000 1000 : ml | ol 
*] : 
5000 900 ge el A ee PUY 
eb sells: he n aba: 
3000 700.1%) 4|| Adit) £5 
2000 Goo so RG ro Bl 
1000 500 ae Lt 
46.—Effect of soil irregularities on relationship between average root we eight 
Madi 
CG: 
and yield of sugar in consecutive check rows, Madison, 1912; solid line indicates 
average weight of root per row; broken line, yield of sugar. 
of percentage would increase the size of the root but decrease the 
proportion of extractable sugar, as large roots have, not only 4 
lower percentage of sugar than small roots, but also a lower 
coefficient of purity. On the other hand, selection for percentage 
alone would decrease the tonnage, as percentage of sugar 15 
