July, 1921 
THE SEEDLING OF PHASEOLUS VULGARIS 
357 
Table 6. Comparison of correlations for trimerous and dimerous seedlings. Differences 
only {trimerous less dimerous) are given. See tables i and 3 for constants 
Correlation Coefficient Compared 
Line 75 . 
Line 93 . 
Line 98 . 
Line 139 
Line 143 
Line 75 . 
Line 93 . 
Line 98 . 
Line 139 
Line 143 
Line 75 . 
Line 93 . 
Line 98 . 
Line 139 
Line 143 
rph 
+ .oi6=t:.o69 
+.408 ±.060 
-.345 ±.053 
+.073 ±.064 
+ .026zt:.039 
+.i68±.o75 
— .171^.076 
— .231 ±.069 
— .269 ±.074 
+.oo6=t.o56 
rhe 
+ .029zb.047 
— .o87zt.040 
-.I35±.050 
+ .I26±.075 
+.149^-053 
0.23 
6.80 
6.50 
1. 14 
0.67 
2.24 
2.25 
3-35 
3-64 
O.II 
0.62 
2.18 
2.70 
1.68 
2.81 
rih 
-•339± 
-.i86± 
-.302 ± 
-.801 ± 
-.329 =t 
rie 
+ .i69=b 
-.i87±, 
-.039 ± 
— .I29=b 
+ .099 zt 
060 
069 
058 
066 
046 
080 
075 
070 
075 
5-65 
2.69 
5.21 
12. 1 
7.15 
2. II 
2.49 
5.57 
1.72 
1.83 
I'bh 
-.I48=b.039 
-.284±.048 
— .200±.039 
-.394±-047 
— .049=t.022 
rbe 
+.236^.079 
-.315^.075 
— .io6±.o69 
-.27o±.o75 
+.069 ±.055 
3.79 
5.92 
5.13 
8.38 
2.23 
2.99 
4.20 
1-53 
3.60 
1.25 
tween the numbers of vascular elements on different sides of the cotyledon- 
ary node as shown in the central and lower section. The exceptions occur, 
in short, among the relationships which in both types of seedlings are 
practically zero in intensity. 
We have no explanation to offer of this greater intensity of correlation 
in the sub-cotyledonary region of the normal seedling. The result is stated 
as one of the matters of fact demonstrated by the investigation. 
Correlation between Bundle Number in Siblings 
The question will naturally arise as to whether the variability in number 
of bundles in both hypocotyl and epicotyl and the correlation between 
bundle number in these two internodes may be due to a differentiation of 
the parent plants from which the seeds were obtained, either in their genetic 
composition or because of environmental influences. This problem pre- 
sents many difficulties. Some light may be thrown upon it in the following 
manner. 
An abnormal and a normal seedling were taken from the same parent 
plant. Thus it is possible to determine in our series the correlation between 
the number of bundles in the hypocotyl of an abnormal plant and in the 
hypocotyl of a normal plant derived from the same parent. If a differentia- 
tion of the parent plants due to either genetic or physiological factors is 
the underlying proximate cause of the variability and correlation in bundle 
number in seedlings which we have studied, there should be a correlation 
between the number of bundles in the seedlings derived from the same 
plant. 
The correlations between the numbers of bundles in the hypocotyls 
