60 
BULLETIN 1403, U. S. DEPARTMENT OF AGBICULTUBE 
Heading period and height were found to be positively correlated, 
the later heading strains being the taller. Only two of the four cor- 
relations, however, were significant, and the average correlation of 
0.133 can not be considered very important. 
Little or no correlation was found between heading period and 
yield. The results in two instances were negative, in two positive, 
and in no case significant. The average correlation was only 0.01 1. 
Only at Havre under severe drought conditions was there found to 
be a significant correlation between heading period and crude- 
protein content. There the later heading strains were found to have 
a greater crude-protein content. Under the favorable conditions at 
Bozeman small positive correlations were obtained, but at Moccasin 
the results were negative. The average correlation of 0.073 is not ? 
important. 
RIPENING PERIOD 
The coefficients of correlation obtained for the ripening period one 
year with another at both Bozeman and Moccasin and at Bozeman 
one year with Havre the next year are given in the first portion of 
Table 55. Following are the coefficients obtained for ripening period 
with fruiting period, height, yield, and crude-protein content. 
Table 55. — Correlation coefficients and probable errors of the ripening period in 
F2 and F2 generations and of ripening period with fruiting period, height, yield } 
and crude-protein content of Marquis-Hard Federation wheat crosses grown at 
Bozeman, Moccasin, and Havre, Mont., in one or both of the years 1923 and 1924 
Ripening period 
Correlated -with — 
F2, Bozeman, 1923 
F2, Moccasin, 1923 S-Ripening period. 
F 2 , Bozeman, 1923 
Total or average 
Total or average. 
F 2) Bozeman, 1923... 
F3, Bozeman, 1924... 
F 3 , Moccasin, 1924... 
F 3 , Havre, 1924 
Total or average. 
F2, Bozeman, 1923. 
F3, Bozeman, 1924. 
F3, Moccasin, 1924. 
F 3 , Havre, 1924 
F 3 , Bozeman, 1924. 
F3, Moccasin, 1924. 
F 3> Havre, 1924... 
F 2 , Bozeman, 1923 
ll; SB Sit:::::::::::: H*™ period 
F3, Havre, 1924 
Total or average 
F 2 , Bozeman, 1923. 
F3, Bozeman, 1924. 
F 3 , Moccasin, 1924. 
F3. Havre, 1924 
F 2 , Bozeman, 1923 
F 3 , Bozeman, 1924 S-Heizht 
F 3 , Moccasin, 1924 .fHeignt. 
F 3 , Havre, 1924 
F 2 , Bozeman, 1923. 
F 3 , Bozeman, 1924. 
F 3) Moccasin, 1924. 
F 3 , Havre, 1924 
Yield. 
'F2, Bozeman, 1923. 
F 3 , Bozeman, 1924. 
F 3 , Moccasin, 1924. 
F 3 , Havre, 1924.... 
Crude protein. 
Fg, Bozeman, 1923. 
F 3 , Bozeman, 1924. 
Fa, Moccasin, 1924. 
F 3 , Havre, 1924 
Number ; Correlation 
of F2 coefficient 
plants or and probable 
F3 strains error 
224 
150 
298 
i 0. 372±0. 039 
-.064± .055 
. 051± . 039 
672 
. 132 
583 
224 
150 
298 
.817± 
.758± 
.654± 
.693± 
.009 
.019 
.032 
.020 
1,255 
.758 
587 
224 
150 
298 
.134± 
.372± 
.196± 
.525± 
.027 
.039 
.053 
.028 
1,259 
.276 
587 
224 
150 
298 
.275± 
.337± 
.177± 
.565± 
.026 
040 
053 
027 
1,259 
.343 
567 
224 
118 
296 
-. 148± 
• 547=h 
.013± 
-. 378± 
028 
032 
062 
034 
Total or average. 
1,205 
060 
The data show that the ripening period is less strongly inherited 
than the heading period. At Bozeman there was an important and 
significant positive correlation obtained, but at Moccasin the cor- 
