82 
AMERICAN JOURNAL OF BOTANY 
[Vol. 8 
Table io. Statistical constants for total 
plants and their normal controls. 
number of bundles at base of hypocotyl of trimerous 
Primary double bundles are counted as two 
Mean 
c. . J rv • ■ Coefficient of 
Standard Deviation Variation 
Line 75 
Trimerous (N = 142) 
Dimerous (N = 142) . 
Actual difference 
Relative difiference 
Line 93 
Trimerous (N = 155) 
Dimerous (N = 155) . 
Actual difference 
Relative difference 
Line 98 
Trimerous (N = 183) 
Dimerous (N = 183) . 
Actual difference 
Relative difference 
Line 139 
Trimerous (N = 106) 
Dimerous (N = 150) . 
I2.i7±.04 
9.07 ±.08 
+3.io=b.o8 
34-18 
12.01 d=.03 
9.86db.o8 
o.75o=b.030 
i.35i±.054 
0.601 d=.o62 
4449 
0.627 ±.024 
1. 483 ±.057 
+2.i5±.o8 
21.81 
11.97dz.02 
8.84±.o6 
+3.i3zb.o6 
3541 
II. 91 ±.04 
8.II±.02 
o.856±.o62 
5772 
0.495 zb.oi8 
I.I90zb.042 
— 0.695 ±.046 
58.40 
o.558±.026 
o.440±.oi7 
Actual difference 
+3.8o±.04 
+o.ii8±.03i 
-0.74rb.30 
Relative difference 
46.85 
26.82 
Line 143 
Trimerous (N = 221) 
1 1.90 zb. 05 
i.io5d=.035 
9.28d=.30 
Dimerous (N = 221) 
8.45 ±.04 
.831 ±.027 
9-84^.32 
Actual difference 
+3.45 ±.06 
+o.274=b.044 
-0.56rh.44 
Relative difference 
40.83 
32.97 
6.i7±.25 
14.901fc.61 
.73 ±.66 
5.22=fc.20 
i5.O41fc.59 
■9.82zfc.62 
4.i4±.i5 
13.47 ±.48 
-9.33i.50 
4.69±.22 
5.43±.2i 
90 
80 - 
10 
eo 
so 
40 
30 
20 
9 10 II 12 13 14- IS ■ le 
L//yf S3 
10 II 12 13 14 
l//y£ /39 
10 II 12 13 
Fig. 16. Percentage frequency distribution of total bundles at base of hypocotyl in 
dimerous and trimerous seedlings. Primary double bundles counted as two. 
