Feb., I92i] HARRIS AND OTHERS — SEEDLINGS OF PHASEOLUS 
75 
number of primary double bundles at the base of the hypocotyl of trimerous 
plants is from 1.38 to 1.89 higher than in the dimerous controls. This 
represents an excess of from 30.5 to 47.0 percent. 
The five lines are not, however, consistent in the relative variability of 
the normal and abnormal seedlings. 
The standard deviation of the number of primary double bundles in the 
trimerous plants is lower than that in the dimerous plants in lines 75, 93, 
and 98. The differences are from 13.7 to 40.5 percent of the control values. 
Lines 139 and 143 are in contrast to the foregoing. The trimerous plants 
of line 139 have a standard deviation of 0.323 d= .015 bundles, whereas the 
dimerous controls have a standard deviation of 0.140 d= .005, giving a 
difference of +.183 ± .016, which is 11.4 times as large as its probable error. 
In line 143 the trimerous plants have a standard deviation of 0.581 ± .019 
bundles as compared with 0.315 =h .010 bundles in the normal controls, 
giving a difference of +.266 ± .021, which is 12.7 times as large as its 
probable error. These are relative differences of +130.7 percent for line 
139 and + 84.4 percent for line 143. 
The same differences in variability between the lines is also conspic- 
uous in the relative variabilities as measured by the coefficients of varia- 
tion. In the first three lines (75, 93, and 98) the coefficients of varia- 
tion in the trimerous plants range from 4.9 to 7.3 percent as compared with 
10.4 to 14.7 percent in the dimerous controls, giving differences in relative 
Table 5. Number of intercalary bundles at base of hypocotyl in trimerous and dimerous 
seedlings 
0 
I 
2 3 
4 
I 
s 
6 
Total 
Line 75 
Trimerous 
116 
20 
5 
I 
142 
Percent 
81.69 
87 
61.27 
14.08 
35 
24.65 
3.52 
II 
0.70 
Dimerous 
5 
2 
2 
142 
Percent 
7-75 
3-52 
1.41 
1.41 
Line 93 
Trimerous 
129 
83.23 
66 
21 
4 
I 
155 
Percent 
13-55 
58 
37-42 
2.58 
24 
15-48 
0.65 
I 
Dimerous 
6 
155 
Percent 
42.58 
3.87 
0.65 
Line 98 
Trimerous 
165 
90.16 
104 
56.83 
96 
90.57 
139 
92.67 
157 
71.04 
156 
70.58 
16 
I 
183 
Percent 
8.74 
52 
28.42 
10 
0.55 
24 
13. 1 1 
0.55 
Dimerous 
3 
183 
Percent 
1.64 
Line 139 
Trimerous 
106 
Percent 
9-43 
II 
Dimerous 
150 
Percent 
7-33 
64 
28.95 
61 
Line 143 
Trimerous 
221 
Percent 
Dimerous 
4 
1.80 
221 
Percent 
27.60 
