Corn Investigations 
75 
Second and third generation hybrids were produced by arti- 
ficially close breeding a number of ears in the and F 2 genera- 
tions respectively with composite pollen from a number of 
plants. 
RESULTS WITH FIRST GENERATION VARIETY HYBRIDS 
Table 28 reports the yields for the four separate years, 
as well as the average for the period. The difference in yield 
between the first generation hybrids and their two parents has 
been calculated. None of the variety crosses showed an in- 
creased yield above the better of the two parents. As an aver- 
age for all the hybrids, the yield was 1.6 bushels lower than the 
mean for both parents, and four bushels lower than for the best 
parents. Table 29 summarizes briefly for a number of plant 
characters the average deviation of all hybrids from the 
parents individually, as well as from their average. These re- 
Fig. 20. — To be compared with figure 19. Corn to left of man, Hogue’s 
Yellow Dent; to the right, first generation hybrid between Hogue’s 
Yellow Dent and Minnesota No. 13. Note the intermediate character 
of the cross. (Table 27.) 
