FACTORS FOE YIELD AND QUALITY OF SPRING WHEAT 
43 
of 16 strains at Havre. Strain Bl-65, the second tallest strain at 
that station, is the progeny of an F 2 plant only 33 inches tall. 
Of the short F 3 strains, only Bl-78 at Havre was significantly 
shorter than the nearest labeled check row of Hard Federation. As 
this same strain was the tallest of 25 F 3 strains at Bozeman, it is 
apparent that drought caused the shortness of this strain at Havre. 
The other short F 3 strains were not significantly shorter than Hard 
Federation, and at Bozeman none were as short. On a plant basis, 
only at Havre under unfavorable conditions was there any indication 
of transgressive inheritance for height of F 3 strains, and as these 
plants were not of normal stature little importance is given to the 
results being due to inherent causes. 
All F 3 hybrid plants studied for date of heading, ripening, and con- 
sequent length of fruiting period were measured also for height. 
These data in comparison with the heights of individual plants from 
duplicate parent check rows are given in Table 40. 
Table 40. — Height of 2,021 F z 'plants of Marquis-Hard Federation wheat crosses, 
in comparison with the -parents, grown at Bozeman and Havre, Mont., in 1924 
Bozeman 
Havre 
Height of plant 
F 3 
hybrids 
Hard 
Federa- 
tion 
Marquis 
F 3 
hybrids 
Hard 
Federa- 
tion 
Marquis 
11.5 inches ... . . 
2 
10 
40 
70 
127 
151 
153 
103 
45 
22 
3 
13.5 inches 
2 
1 
12 
26 
26 
21 
24 
4 
1 
15.5 inches . 1 
4 
17.5 inches.. _ 
1 
2 
25 
29 
67 
145 
241 
230 
157 
203 
115 
52 
19 
2 
18 
19.5 inches. ... 
44 
21.5 inches. . 
1 
14 
29 
35 
33 
12 
1 
19 
23.5 inches . 
1 
3 
4 
9 
9 
9 
39 
22 
14 
4 
1 
16 
25.5 inches 
16 
27.5 inches 
3 
29.5 inches 
4 
31.5 inches . 
33.5 inches 
37.5 inches. _ . 
1 
39.5 inches ._ _. 
^1.5 inches.. . 
4j. 5 inches 
:::::::::: 
4cL 5 inches _. 
Total.. 
1,295 
33.79 
126 
27.58 | 
116 
36.95 
726 
21.94 
• 117 
21.91 
124 
Average height in inches 
21.19 
The F 3 plant data from Bozeman given in Table 40 are shown 
graphically in Figure 7. These data confirm the F 2 plant and F 3 
row Cata in showing that the hybrids are intermediate to the parents. 
The variability of F 3 plants also is not greater than that of the 
Marqiis parent. 
At Havre, Hard Federation was slightly taller than the Marquis 
parent, on account of droughty conditions, and the F 3 hybrids 
slightly Waller than both parents. The variability in height of the 
hybrids md parents at Havre was practically the same. 
From Ihe F 2 and F 3 studies it may be concluded that height is 
inherited xi intermediate degrees and without significantly greater 
variability than that of the parents. The respective heights of the 
