24 
BULLETIN 1403, U. S. DEPARTMENT OF AGRICULTURE 
Bozeman and Havre. The means and differences, with their prob- 
able errors, are shown in Table 24. 
As the differences are all greater than three times their probable 
errors, it appears that transgressive segregation for lateness of 
heading has been obtained. 
Table 24. — Comparison of two late-heading strains with nearest Marquis checks 
Strains compared 
Bozeman 
Havre 
Bl-78 
16. 6±0. 43 
14. 3± .32 
19. 2±0. 53 
15. 0± . 17 
2.3± .54 
4.2± .56 
A2-77 . 
16. 2± .39 
14. 3± .32 
15. 9± .22 
15. 0± . 17 
1.9± .50 
.9± .28 
One of the most striking features of the individual F 3 plant data is 
the variation in the number of days required for the different strains 
to pass through the heading stage from first heading to fully headed. 
Florell (9) concluded that "it is possible to determine progeny 
rows homozygous for earliness in F 3 and subsequent generations of 
hybrids by the time required for them to pass through the heading 
stage." 
Table 25. — Dates of heading of 2,017 F z plants of Marquis-Hard Federation 
wheat crosses, in comparison with the parents, grown at Bozeman and Havre, 
Mont, in 1924 
Bozeman 
Havre 
Date of heading 
F 3 
hybrids 
Hard 
Federa- 
tion 
Marquis 
F 3 
hybrids 
Hard | 
Federa- ! Marquis 
tion 
July 4 
24 
87 
155 
175 
73 
163 
61 
162 
96 
113 
98 
47 
31 
17 
3 
6 
16 
6 
11 
21 
29 
29 
8 
1 
13 
2 
9 
4 
2 
4 
2 
July 5 
July 6 
1 
2 
1 
4 
6 
6 
1 
10 
20 
13 
14 
9 
2 
2 
5 
5 
2 
July 7 . 
1 
17 
28 
36 
19 
10 
.3 
1 
July 8 
July 9 
5 
52 
100 
124 
118 
88 
84 
20 
18 
12 
15 
7 
6 
6 
2 
July 10 
July 11 
July 12-. 
July 13 
12 
July 14 
33 
July 15 
33 
July 16-. . 
14 
July 17 
1 
9 
July 18 
7 
July 19 
2 
July 20 
1 
July 21 
2 
July 22 
July 23 
1 
July 24 
4 
3 
6 
1 
1 
July 25 .- 
3 
2 
July 26 - - 
July 27 
July 28 .- 
2 
July 29 - 
July 30-.- 
1 
Total 
1,360 
10.2 
125 
7.0 
110 
15.4 
657 
13.3 
115 
9.9 
114 
Average date, July 
15.3 
