1916] PRITCHARD—SUGAR-BEET BREEDING 465 
4. Areas of beets in an apparently uniform field of small dimen- 
sions showed a difference of 2 per cent sugar. 
5. Percentage of sugar and yield of sugar of sugar-beet rows 
vary independently. Progeny rows should be graded on both 
percentage and yield of sugar, therefore, or on yield of extractable 
sugar. 
6. The average weight of root per row increases with yield of 
Sugar and decreases with percentage of sugar. 
7- The discontinuance of selection for one generation caused no 
deterioration in percentage of sugar. In fact, there was some 
apparent gain. 
8. No improvement in yield or percentage of sugar was obtained 
by continuous selection. Both the good and the poor families 
transmitted average qualities. 
BurEAv oF Prant INDUSTRY 
Wasuincton, D.C. 
