PRODUCTIVENESS OE SELF-FERTILIZED CORN 9 
The average yields of the better of each of three pairs of crosses 
made following five generations of self-fertilization represented by 
analogous crosses made following four generations of seli-fertilization 
are shown as average C. The corresponding averages for the poorer 
crosses of the pairs are shown as average D. The difference following 
four generations of self-fertilization is small. This difference also is 
even less significant than its size might indicate, as it results chiefly 
from one large difference. It is evident that four generations of 
inbreeding were not enough to establish uniformity of behavior in 
combination sufficient to permit picking the better lines for crossing 
in this particular material. Whether this lack of individuality of the 
lines in crosses is an accident due to the choice of the lines for the 
experiment is not known. None of these crosses were particularly 
productive, and certainly there is more individuality shown in the 
behavior of other crosses, to be considered later. 
Table 5. — Yield of self-fertilized lines of corn and of crosses between them J 
Pistillate parent 
Cross 
Staminate parent 
Pedigree No. 
Yield 
per acre 
(bushels) 
Yield 
per acre 
(bushels) 
Yield 
per acre 
(bushels) 
- 
Pedigree No. 
12-1-1-1-2-S 
24.0 
21.2 
19.6 
12.1 
23.3 
27.7 
13.9 
11.1 
27.1 
24.5 
20.2 
14,5 
23.5 
24.0 
21.7 
19.6 
14.5 
41.1 
11.1 
23.5 
27.5 
13.9 
27.5 
8.7 
25.1 
23.8 
48.5 
46.9 
43.8 
43.3 
42.6 
41.4 
40.9 
40.4 
40.1 
40.0 
38.1 
38.0 
37.9 
37.9 
37.5 
37.4 
37.1 
36.8 
36.2 
36.0 
34.8 
33.9 
33.1 
31.6 
28.6 
22.0 
13.9 
21.2 
12.0 
■ 13.8 
2-2-2-4-4-S. 
3-1-1-3-S 
5-1-2-5-S. 
9-2-1-2-S 
12-1-2-3-S. 
3-1-1-S 
5-1-2-S. 
2-2-2-S.. 
7-1-1-S. 
9-2-1-2-1-S 
11.1 
12-1-2-3-2-S. 
2-2-2-4-4-S 
7-1-1-1-3-S. 
12-1-2-3-2-S-. 
- 13.9 
12.3 
2-2-2-4-4-S. 
3-1-1-3-1-S 
5-1-2-5-2-S. 
2-2-1-S 
7-1-1-S. 
9-2-2-S 
27.5 
12-i-i-S. 
2-2-2-4-S 
7-1-1-1-S. 
12-1-1-1-S. 
1.9 
7.6 
14.5 
9.7 
2-2-2-2-S. 
12-1-1-1-2-S... 
2-2-2-2-3-S. 
12-1-1-2-S 
2-2-2-4-S. 
3-1-1-4-S 
•5-1-2-3-S. 
2-2-2-4-S. 
7-1-1-2-S. 
9-2-1-S 
9.4 
7.6 
14.5 
24.5 
12-1-2-S. 
12-1-2-3-2-S.. 
2-2-2-2-3-S. 
12-1-1-1-S- 
2-2-2-4-S. 
12-1-1-S 
2-2-1-S. 
2-2-2-4-4-S 
7-1-1-2-3-S. 
12-1-1-S __ 
23.3 
6.1 
21.7 
11.1 
2-2-2-S. 
3-1-1-4-3-S 
5-1-2-3-1-S. 
9-2-2-1-S 
12-1-1-2-S. 
9-2-3-2-3-S 
12-1-2-3-2-S. 
The coefficient of correlation between the yield of a cross and that of its pistillate parentis —0.07 ±0.12. 
RELATION BETWEEN PRODUCTIVENESS OF PARENT LINES AND CROSSES 
There is no outstanding difference between the average yields of 
the crosses made after three, four, and five generations of self-fertili- 
zation. Neither is there any pronounced difference between the 
average yields of the self-fertilized lines in the fourth, fifth, and sixth 
generations. The relation of the productiveness of the crosses to that 
of the parent lines in these three generations may therefore be con- 
sidered as a unit. The yields of the crosses are shown in Table 5, 
arranged in the order of their productiveness. The yields of the 
parent lines also are shown, in so far as they are available. No par- 
48045— 25t 2 
