July,*i92i] 
THE SEEDLING OF PHASEOLUS VULGARIS 
349 
are in general somewhat higher than those for either of these two classes. 
The average value of the 5 coefficients for trimerous seedlings is +.5976 
while that for dimerous seedlings is +.8126. 
Turning to the diagrams, we note that the straight lines and the empirical 
means are in excellent agreement, considering the small number of seedlings, 
in the case of the normal plants, but show greater irregularities in the case 
of the abnormal plants. This is due to a considerable extent to the greater 
concentration of the frequencies into two classes in the case of the trimerous 
seedlings. 
We may now consider the relative magnitudes of the three correlations 
which we have been studying. Table 2 shows the differences existing be- 
Table 2. Comparison of correlations between the various types of bundles at the base of 
hypocotyl and the number of bundles in the central region of hypocotyl 
Character of Seedlings 
and Line 
'^bh — rph 
nil — nil 
rph — nil 
Trimerous 
Line 75 
+ .271 ±.059 
4-59 
+.32o±.o6i 
5.25 
+.049±.07i 
0.69 
Line 93 
+.236=b.o66 
3.58 
+.265±.o67 
3-95 
+.029 ±.073 
0.40 
Line 98 
+.265 ±.056 
4.73 
+ .333 ±.057 
5.84 
+.o68±.o65 
1.05 
+.ii4±.07i 
1.61 
+.434rt.o8o 
5.43 
-i-.320zh.084 
3.81 
Line 143 
+.I97±.037 
5.32 
4". 448 ±.046 
974 
+ .251 ±.051 
4.92 
Dimerous 
Line 75 
+.435 ±.053 
8.20 
+.I29±.037 
3-49 
-.3o6±.058 
5.28 
Line 93 
+ .II2zl=.040 
2.80 
+.363 ±.051 
.7-11 
-l-.251d1.056 
4.48 
Line 98 
+.i20±.033 
3-64 
+.231 ±.040 
5.78 
+.11 1 ±.045 
2.47 
Line 139 
+.581^.035 
16.6 
+ .027zh.OIO 
2.70 
-.554±.035 
15.8 
Line 143 
+ .272 dr. 026 
10.5 
+ .l68±.022 
7.64 
— .i04=h.03o 
3-47 
tween the various correlations, i.e., the possible differences between the 
correlation for primary bundles and hypocotyledonary bundles, Tph, for 
intercalary bundles and hypocotyledonary bundles, fih, and for total bundles 
at the base of the hypocotyl and hypocotyledonary bundles, fbh. 
For both dimerous and trimerous seedlings, the correlations between the 
total bundles at the base of the hypocotyl and. the number of bundles in 
the central region of the hypocotyl are higher throughout than those for 
either of the two separate types of bundles (primary bundles and inter- 
calary bundles) individually considered. In general, the differences are 
sufficiently large in comparison with their probable errors to be considered 
statistically significant. 
The comparison of the magnitudes of the correlations between numbers 
of primary double bundles and of vascular elements at higher levels, and 
between numbers of intercalary bundles and of vascular elements at higher 
levels, shows that in 7 of the 10 comparisons the closer correlation of hypo- 
cotyledonary bundles is with the primary double bundles. 
Lines 75, 139, and 143 present exceptions. In the normal plants of these 
lines the correlation between intercalary bundles and total bundles in the 
