42 
BULLETIN 1403, U. S. DEPARTMENT OF AGRICULTURE 
Havre, Marquis averaged less than an inch taller than Hard Federa- 
tion, and there was an average difference of 9 inches at Bozeman 
and of 3.5 inches at Moccasin. Figure 8 shows that the height 
increased at the stations in the order — -Havre, Bozeman, and Mocca- 
sin. Earlier seeding probably accounts for the greater height at 
Moccasin than at Bozeman. The height of row in the F 3 generation 
indicates a greater variability for the hybrids in comparison with the 
parents than the height of plants in F 2 . At Moccasin and Havre 
the extreme short and at Moccasin the extreme tall rows of the 
parents were exceeded by rows of the hybrids. 
Selections were made. in the F 2 generation on a height basis, and 
some of the tallest F 2 plants were included among the strains studied 
on the individual plant basis in F 3 . The tallest and shortest of these 
strains, compared with the nearest studied parent rows at Bozeman 
and Havre, are given in Table 39. 
Table 39. — Height of individual F 3 plants of short and tall strains of Marquis- 
Hard Federation wheat crosses, in comparison with the parents, grown at Bozeman 
and Havre, Mont., in 1924. 
Bozeman strain and row Nos. 
Havre strain and row Nos. 
Short stature 
Tall stature 
Short stature 
Tall stature 
Height of plant 
B3-7; 
24 
B3-29; 
27 
Hard 
Fed- 
era- 
tion; 
20 
Bl-78; 
4 
A2-77; 
17 
Mar- 
quis; 
10 
A 1-24; 
169 
Bl-78; 
26 
Hard 
Fed- 
era- 
tion; 
40 
Bl-47; 
316 
Bl-65; 
203 
Mar- 
quis; 
290 
11.5 inches - 
2 
7 
6 
8 
8 
9 
8 
2 
13.5 inches 
1 
14 
18 
12 
2 
2 
1 
12 
25 
18 
5 
2 
15.5 inches 
1 
17.5 inches 
1 
-- 
3 
7 
10 
10 
6 
1 
1 
2 
6 
18 
7 
3 
2 
3 
19.5 inches 
8 
21.5inches 1 
L. 
9 
23.5 inches j 3 
25.5 inches 
2 
1 
5 
14 
10 
10 
8 
7 
1 
16 
16 
27.5 inches- 
9 
6 
5 
16 
25 
4 
1 
1 
„ 
5 
5 
10 
16 
10 
5 
1 
3 
29.5 inches 
2 
1 
1 
2 
4 
10 
9 
12 
9 
7 
1 
3 
21 
18 
12 
4 
1 
1 
....1 
1 
1 
Total 
Average 
height 
in inches 
32 
29.1 
42 
30.3 
62 
28.1 
54 
38.7 
52 
38.5 
62 
39.0 
50 
18.8 
47 
17.5 
65 
19.9 
39 
25.8 
?9 
25.7 
60 
23.4 
Strain Bl-78 was the tallest of those studied at Bozemar and the 
shortest at Havre. In the F 2 generation the parent plart of this 
strain was 39 inches tall when the average height of Hard Federa- 
tion was 30 inches and that of Marquis 43 inches. This is an impor- 
tant example of the wide variations that may be obtained for height 
under different environmental conditions. None of tfce progenies 
of the tallest F 2 plants ranked among the tallest at eithei Bozeman or 
Havre. The second tallest F 3 strain at Bozeman, X2-77, is the 
progeny of an F 2 plant 34 inches tall. Strain Bl-47, the parent 
plant of which was 36 inches tall in the F 2 generation, was the tallest 
