te 
ss j 
SSS Yield of seed in ounces in 1906 
ea ie [4.18 16/7 18 19 20 2 
OF71 | 
22\_| , Po 
2.7 ‘ oe WE OE 
3.2 or 4 
434 BOTANICAL GAZETTE [DECEMBER 
same conclusion. However, Bartos‘ has found that seed produc- 
tion decreases as percentage of sugar increases. His average dif- 
ferences are only 3.3 and 8.6 per cent, however; and in the 
absence of probable errors we have no means of determining 
whether they bear any significance. 
Fic. 7.—To accompany table VII 
If percentage of sugar were negatively correlated with seed 
yield, as Barros believes, it would constitute an undesirable 
relationship. Even positive correlation between percentage of 
sugar and seed yield, or between weight of root and seed yield, 
would form a less desirable relationship than the absence of correla- 
re tion, as high percentage is corre- 
sie Fa lated with low yield and high 
Egs Nepeniens Dn ced aides tonnage with low purity. Maxi- 
Os mum sugar production is depend- 
a ent upon both percentage and 
wal 
a 
tonnage, and consequently cannot 
—“ run to either extreme. Positive 
Fic. 8.—To accompany table VIII correlation between extractable 
sugar and seed yield, however, 
would constitute a very desirable relationship, as selection for maxi- — 
mum sugar production would also tend to increase the seed yield. 
RELATIONSHIP BETWEEN A ROOT’S YIELD OF SEED AND THE 
PERCENTAGE OF SUGAR IN ITS PROGENY.—No distinction between 
individual sugar-beet plants can safely be made in the seed genera- 
tion until we learn what relationship exists between a root’s yield 
of seed and the average sugar-producing capacity of its progeny- 
4 Barros, V., Je zucherhaltiger die Riibensorte ist desto kleinere Samenfrucht- 
barkeit hat sie. Cukrovarnicke Listy, December, 1908; rev. Bl. Zucherriibenbau 
16:93. 1909. 
