Feb., I92i] HARRIS AND OTHERS — SEEDLINGS OF PHASEOLUS 
77 
The percentages of the seedHngs with no intercalary bundles in the two 
classes of plants and the differences in the percentage are as follows : 
Trimerous 
Dimerous 
Difference 
Line 75 
81.69 
61.27 
+ 20.42 
Line 93 
83.23 
42.58 
+ 40.65 
Line 98 
90.16 
56.83 
+33.33 
Line 139 
90.57 
92.67 
— 2.10 
Line 143 
71.04 
70.58 
+ 0.46 
The physical constants in table 6 show that the mean number of inter- 
calary bundles in both normal and abnormal seedlings is small — less than a 
single bundle per plant in every case. 
Table 6. Statistical constants for number of intercalary bundles at base of hypocotyl of 
trimerous plants and their normal controls 
Mean 
Standard Deviation Coefficient of Variation 
Line 75 
Trimerous (N = 142) 
Dimerous (N = 142) . 
Actual difference 
Relative difference 
Line 93 
Trimerous (N = 155) 
Dimerous (N = 155). 
Actual difference . . 
Relative difference 
Line 
Trimerous (N = 183) 
Dimerous (N = 183). 
Actual difference 
Relative difference 
Line 139 
Trimerous (N = 106) 
Dimerous (N = 150). 
Actual difference 
Relative difference 
Line 143 
Trimerous (N = 221) 
Dimerous (N = 221). 
Actual difference . . 
Relative difference 
.25 ±.04 
.63 ±.06 
o.686±.027 
I.024zfc.04I 
270.69 ±42.86 
161.60zb16.13 
-.38±.07 
60.32 
.21 ±.03 
.83±.05 
■0.338 ±.049 
33.00 
.545±.02i 
.874dz.033 
+ 109.09 ±45.79 
255.8o±36.78 
I05.79± 7.29 
.62 ±.06 
74.69 
.I3±.02 
.6o±.04 
.329 ±.039 
37.64 
.48o±.oi7 
.776±.027 
+ 150.01 ±37.50 
38i.67±73.88 
130.21 ± 9.62 
.47 ±.04 
78.33 
.09 ±.02 I 
.o7±.oi j 
.296±.032 
38.14 
.292±.0I4 
.26l±.0I0 
+25i.46±74.50 
309.84±64.50 
355.48±70.95 
+ .02 ±.02 
+ .031 ±.017 
- 45.64±95.89 
28.57 
11.88 
.29±.02 
.454±.oi5 
I56.62±I2.2I 
.31 ±.02 
.501 ±.016 
i6o.44±i2.76 
— .02 ±.03 
— .047 ±.02 1 
- 3.82±i7.66 
6.45 
9.38 
Again the lines fall into two classes, those in which the number of inter- 
calary bundles is conspicuously higher in the dimerous plants (lines 75, 
93, and 98) and those in which the numbers are essentially identical (lines 
139 and 143). In the trimerous seedlings of the first group the average 
number ranges from 0.13 to 0.25, whereas in the dimerous it varies from 
0.60 to 0.83 bundle. Thus the mean number of intercalary bundles is 
