54 
BULLETIN 1403, U. S. DEPARTMENT OF AGRICULTURE 
At Havre 41 plants of it averaged but 15.1 per cent, which was not 
high in comparison with other strains and Marquis checks. 
The data on individual plants of F 3 families do not show that 
transgressive segregation has been obtained for higher crude-protein 
strains than the Marquis parent, though at Bozeman one strain was 
obtained which had a significantly lower crude-protein content 
than Hard Federation. 
Many F 3 strains which are significantly different in crude-protein 
content have been obtained, differing on the average by as much as 
4.3 per cent at Bozeman and 2.9 per cent at Havre. The differences 
of numerous strains are from 5 to 10 times their probable errors. 
Besides certain F 3 families studied for crude protein in individual 
plants, selections of promising plants were made in additional families 
and analyzed for crude-protein content. The frequency results 
obtained from all individual F 3 plants and parents at the three 
stations are presented in Table 49, and the Bozeman data are shown 
graphically in Figure 11. 
Table 49. — Crudt-protein content of grain from 1,619 F 3 plants of Marquis-Hard 
Federation wheat crosses and $I±2 parent plants grown at Bozeman, Moccasin, and 
Havre, Mont., in 1924 
Number of plants 
Crude-protein content 
Bozeman 
Moc- 
casin 
Havre 
F 3 
hybrids 
Hard 
Federa- 
tion 
Marquis 
F 3 
hybrids 
Fa 
hybrids 
Hard 
Federa- 
tion 
Marquis 
8 per cent.. . 
1 
8.5 per cent.. . 
3 
6 
18 
21 
27 
23 
1 
9 per cent . . . - . 
9.5 per cent. ._ . . 
1 
2 
10 
3 
5 
4 
10 per cent 
I 
2 
3 
6 
17 
25 
10.5 per cent... .. 
11 per cent __ . . 
3 4 
1 
4 
2 
6 
7 
20 
40 
50 
62 
83 
61 
74 
56 
47 
27 
15 
2 
11.5 per cent. . 
16 ! 3 
25 ■ 4 
34 4 
34 4 
33 3 
40 8 
43 ; 8 
80 i 4 
108 | 5 
117 8 
70 4 
49 4 
12 3 
12 
9 
5 
12 per cent _ .._ 
12.5 per cent .. 
13 per cent.. . . . . 
3 1 60 
1 53 
1 
4 
7 
9 
13 
22 
13 
15 
3 
2 
1 
1 
13.5 per cent . .. .- 
14 per cent.. .. - 
1 
3 
3 
2 
2 
7 
4 
10 
3 
1 
1 
55 
45 
24 
6 
14.5 per cent 
1 
15 per cent 
3 
15.5 per cent . 
4 
16 per cent . 
6 
16.5 per cent .. 
12 
17 per cent .. .. 
18 
17.5 per cent . 
23 
18 per cent 
5 
1 
1 
18 
18.5 per cent 
4 
19 per cent . 

Total. 
765 
14.42 
79 
13.80 
83 
13.75 
297 
13.54 
557 
15.78 
90 90 
Average per cent 
15. 46 17. 06 
The Bozeman data show that the selected F 3 plants averaged 
slightly more than individual plants from two extremely variable 
check rows of both parents. At Moccasin the hybrid F 3 plants 
averaged less than single tests of the parents grown in check rows, 
as shown in Table 49. The variability of the hybrids at Moccasin 
is about one-half that at Bozeman. At Havre the F 3 hybrids are 
intermediate between the parents but average nearer the lower protein 
Hard Federation parent. The hybrids, partly on account of greater 
numbers, appear more variable than the parents, exceeding them 
