430 
AMERICAN JOURNAL OF BOTANY 
[Vol. 8, 
to +.80 in the trimerous and from +.76 to +.97 in the dimerous plants. 
The correlations for the dimerous plants are in all five cases slightly higher 
than those for the trimerous plants. 
Table 2. Comparison of Correlation between Total Bundles and Primary Double Bundles^ 
Tbp, and between Total Bundles and Intercalary Bundles, ru, at Base of Hypocotyl 
Trimerous 
Dimerous 
Diff. 
N 
r 
r 
N 
r 
r 
Difference 
Line 75 
m 
rbp 
142 
142 
+ .7788±.0222 
+ .i532±.0552 
35-1 
2.77 
142 
142 
+ .8872±.oi20 
+ .3536^.0495 
73-9 
7.14 
— .io84±.0245 
— .2004±.074i 
4.42 
2.70 
m — rbp- 
Line 93 
rbi 
rbp 
155 
155 
+ .6256^.0591 
+ .6934±.028i 
+ .i409±.053i 
10.6 
24.7 
2.65 
155 
155 
+ .5336=b.o5io 
+ .7628zt.0226 
+ .5292 ±.0390 
10.5 
33-8 
13-6 
— .0694 ±.0361 
-.3883±.o655 
1.92 
5-92 
fbi ^bp ■ 
Line 98 
m 
Tbp 
183 
183 
+ .5525 ±.0600 
+ .8001 zb.0179 
— .0664 ±.0496 
9.21 
44.6 
1-34 
183 
183 
+ .2336±.0447 
+ .8833d=.oio9 
+ .5245^.0361 
5-23 
81.0 
14-5 
— .0832 ±.0200 
— .5909zh.o6i6 
4.16 
9-59 
rhi — rip. 
Line 139 
rbi 
Tbp 
106 
106 
+ .8665^.0529 
+.4203 ±.0539 
+ .5707 ±.0422 
16.4 
7.79 
12.9 
305 
305 
+ .3588^.0374 
+ .9721 d=.002I 
+ .3649^.0335 
9-59 
457-4 
10.9 
-.5518^.0539 
+.2058±.0555 
10.2 
3.71 
rbi—rbp. 
Line 143 
rbi 
rbp 
221 
221 
-.1504 ±.0697 
+ .4382^.0367 
+ .7I26=b.0223 
2.16 
11.9 
31.9 
420 
420 
+ .6072^.0336 
+ .8715 +.0079 
+ .5i96±.o240 
18. 1 
no. 2 
21.6 
-.4333±-0375 
+ .i930d=.0328 
11.55 
5.88 
rbi—rbp. 
— .2744 d=. 0429 
6.40 
+ .35i9±.0253 
13-9 
The correlation between the total number of bundles and the number of 
primary double bundles is in general much lower. In line 98 the coefficient 
actually has the negative sign in the trimerous series. The differences 
between the correlation coefficients for total bundles and intercalary bundles, 
and for total bundles and primary double bundles, range from —.27 to +.87 
in the trimerous plants and from +.23 to +.61 in the dimerous plants. 
It is clear that the two types of plants differ rather fundamentally in this 
correlation. The correlation between the total bundles and the primary 
double bundles is very low in the trimerous plants. It is a much more 
substantial value in the dimerous plants. 
Pursuing this point one step farther, we may determine by a special 
formula the relationship between the total number of bundles and the 
deviation of the number of intercalary bundles from the number which 
would be expected if the number of primary double bundles and intercalary 
bundles were in proportion to the total number of bundles formed. 
Determining the correlation between the total number of bundles, b, 
