Corn Investigations 
143 
plats. Four hundred and ninety-seven ears of Xebraska White 
Prize corn were subjected to the same manner of testing and 
treatment. From among these, 39 disease free ears and 39 badly 
diseased ears were tested in ear-to-row plats. 
The relation between type of ear planted and yield per acre 
in these diseased and disease free classes is shown in Table 61 
and charts 6 and T. For both varieties no advantage was found 
in selection for freedom from disease by the germinator test. 
On the other hand, the smooth ears definitely surpassed the 
rough ears for both varieties, and in all cases except the disease 
free Xebraska White Prize they distinctly surpassed the original 
corn from which they were selected. 
In case of the disease free Hogue's Yellow Dent, the smooth 
Chart 7. — Ear type versus root-rot disease selection. At the left and 
right are shown the grain yields of ordinary unselected seed corn in 
comparison with ear-to-row plats which had been classified respec- 
tively by the germinator test into disease free and badly diseased 
groups. The ear-to-row plat yields are grouped according to the 
type of seed ear planted. Data taken from Table 61. 
