3i° 
Journal of Agricultural Research 
Vol. XXV, No. *, 
Table VI .—Correlation coefficients of the measured characters in the three groups of F 2 
plants of the dwarf-brachytic hybrid , normal , brachytic, and dwarf 
Height. 
Length 
fifth 
leaf. 
Width 
fifth 
leaf. 
Number 
tassel 
branches. 
Total 
number 
leaves. 
Leal 
index. 
Stature. 
Height. 
\ 
0.215 
•434 
.441 
0. 217 
-.281 
•399 
~o. 045 
-.071 
. 164 
0.161 
0.109 
—.476 
—•04s 
Normal. 1 
Brachytic. 2 
Dwarf. 3 
Length. 
fifth 
leaf. 
• 215 
•434 
.441 
\' 1 
•255 
—. 161 
• 620 
.241 
.462 
• 205 
—. 100 
"“•393 
— .672 
—. 261 
Normal. 
Brachytic. 
Dwarf. 
Width 
fifth 
leaf. 
.217 
281 
•399 
•255 
161 
• 620 
\ 
\ 
\ 
.422 
.189 
. 148 
. 118 
.618 
.782 
.496 
Normal. 
Brachytic. 
Dwarf. 
Number 
tassel 
branches. 
-045 
-.071 
• 164 
.241 
. 462 
.205 
.422 
. 189 
. 148 
\ 
\ 
\ 
• 
•032 
.197 
192 
148 
Normal. 
Brachytic. 
Dwarf. 
Total 
number 
leaves. 
. 161 
-. 100 
.118 
.032 
.142 
Normal. 
Leaf 
index. 
.109 
-.476 
-.045 
-393 
-.672 
261 
.618 
.782 
.496 
• 197 
192 
-. 148 
.142 
\ 
Normal. 
Brachytic. 
Dwarf. 
1 In the group of normal stature coefficients above 0.103 are greater than three times their error. 
2 In the group of brachytic stature coefficients above 0.190 are greater than three times their error. 
9 In the group of dwarf stature coefficients above 0.147 are greater than three times their error. 
With no genetic interference, wide leaves are found to be correlated 
with tall plants. In the present hybrid the parental combinations 
were the reverse of this association and the short plants had the wide 
leaves. 
When the biserial correlations of type of plant with leaf width are 
examined it is found that as between normal and dwarf stature, short 
stature is correlated with wide leaves, 0.37 ±0.029, and as between 
brachytic and dwarf short stature is associated with wide leaves, 0.43 ± 
0.037. When the two stature groups, normal and brachytic, are com¬ 
pared it is found that tall stature is correlated with wide leaves, 0.2 ± 
0.037. 
As stated above, the product moment correlation between stature 
and leaf width in the brachytic group is —0.281 ±0.045 between tall 
stature and wide leaves. Obviously, such an association can be only 
genetic, since a normal physiological behavior would lead to a positive 
correlation between tall plants and wide leaves. There can be little 
doubt that a genetic correlation of this sort must be reduced in degree 
by an amount proportional to the positive correlation expected for 
physiological reasons. In this case the normal interaction of physio¬ 
logical factors in the brachytic group would be expected to be at least 
as high as that found in the normal group, which is 0.217 ±0.033, so that 
the effect of the genetic factors must be the difference between the corre¬ 
lation observed in the normal group and that found in the brachytic 
group, or 0.498, which is a rather high degree of relationship. 
Such a result indicates that in tie brachytic group there are segre¬ 
gating height factors resembling dwarf in that they are associated also 
