30 
BULLETIN 1403, U. S. DEPARTMENT OF AGRICULTURE 
heading period at the three stations was in the order of Bozeman, 
Moccasin, and Havre, but that the ripening period was reversed, or 
in the order of Havre, Moccasin, and Bozeman. Drought, which 
resulted in forced ripening at Havre, caused this reversed ranking for 
the ripening period. 
The dates of first ripening and 50 per cent ripe were of little value 
at Bozeman because of the damage from root-rot, which resulted in 
about 18 per cent of the hybrids ripening prematurely. At the other 
stations the dates of first and 50 per cent ripe gave no index in them- 
selves as to strains which were homozygous. In the early and late 
classes the variability between first and fully ripe was frequently as 
great as in the intermediate frequency classes. 
The same individual F 3 plants and families were noted for date of 
ripening as for date of heading. F 3 plant data for date of ripening in 
comparison with the parents, therefore, are available from two sta- 
tions. There was not so marked a variation among the frequency 
distributions of the various families as was the case for date of 
heading. 
Some of the earliest and latest ripening F 2 plants were included 
among the families studied in F 3 . Data for the earliest of these rows, 
compared with the nearest labeled check rows of Hard Federation 
and the latest rows in comparison with the nearest labeled check 
row of Marquis at both Bozeman and Havre, are given in Table 30. 
Table 30. — Dates of ripening of individual F 3 plants from early and late strains 
of Marquis-Hard Federation wheat crosses, in comparison with the parents, 
grown at Bozeman and Havre, Mont., in 1924- 
Bozeman strain and row numbers 
Havre strain and row numbers 
Early ripening 
Late ripening 
Early ripening 
Late ripening 
Time of ripening 
B2-94; 
226 
B1^7; 
230 
Hard 
Feder- 
ation; 
220 
Bl-78; 
2 
B3-5; 
23 
Mar- 
quis; 
10 
B2-94; 
159 
Bl-47; 
316 
Hard 
Feder- 
ation; 
300 
Bl-78; 
26 
A2-77; 
72 
Mar- 
quis; 
10 
8 
16 
27 
1 
August 13.5. .. 
1 
1 
16 
19 
2 
12 
13 
13 
1 
2 
29 
16 
August 15.5 
12 
21 
2 
41 
August 17.5 
August 19.5 
2 
6 
3 
1 
5 
6 
1 
23 
1 
1 
1 
August 23.5 
August 25.5 
August 27.5 
August 29.5 
3 
1 
2 
1 
3 
2 
1 
9 
11 
1 
1 
4 
6 
4 
1 
3 
6 
3 
11 
5 
i 
i 
September 2.5... 
3 
1 
4 
22 
10 
4 
10 
24 
8 
i 
13 
28 
9 
September 6.5... 
10 
Total - 
28 
28.9 
34 
29.3 
52 
29.7 
39 
50 
53 
37 
14.7 
39 
15.7 
52 
14.3 
47 
16.1 
35 
16.9 
65 
Average time 
of ripening: 
16.3 
5.9 
4.9 
5.9 
Strain B2-94 was the earliest of 25 studied at Bozeman for date 
of ripening in 1924. This family was the progeny of one of the latest 
ripening F 2 plants, which ripened on September 6, 1923. The average 
date of ripening of Hard Federation in 1923 was August 30. In 
