358 
AMERICAN JOURNAL OF BOTANY 
[Vol. 8. 
and epicotyls of the normal and abnormal seedling, i.e., of dimerous and 
trimerous seedlings, from the same parent plants are given in table 7.® 
Table 7. Correlations between bundle number in offspring of same parent plant 
Character of Plant and 
Organs Compared 
Line and Correlation 
Trimerous 
Dimerous 
Line 75 
Line 93 
Line 98 
Hypocotyl .... 
Hypocotyl 
C. S. H 
Epicotyl 
C. S. H 
Storrs 
+ .0540 zb. 0406 
+ .2I5I±.0540 
-.0037 ±.0407 
+ .0685^.0563 
+ .1703^.0327 
+ .0553 ±.0540 
— .0027 ±.0336 
+ .0432 ±.0541 
-.0512^.0529 
+ .0853 ±.0495 
+ .I222rb.0522 
+ .0401 ±.0498 
The coefficients are low throughout. Nine of the 12 are positive while 
3 are negative in sign. Only 2 of the 12 can be reasonably regarded as 
significant. Both of these are positive. There is, therefore, a suggestion 
of a positive correlation between the anatomical characters of seedlings 
from the same parent. The values are too low, however, to justify the 
conclusion that there is a measurable differentiation in the genetic or 
physiological characteristics of the parent plants affecting bundle number 
in the offspring seedling. 
The absence of correlation here connotes an absence of (sororal or fra- 
ternal) inheritance in bundle number. 
Summary 
In an earlier paper we have shown that the number of vascular elements 
at different levels in the seedling of Phaseolus vulgaris is subject to consider- 
able variation and that the amount of variation may itself differ from level 
to level. This is true both in normal seedlings with two cotyledons and 
two primordial leaves and in variant seedlings with three cotyledons and 
a whorl of three primordial leaves. These two types of seedlings are pro- 
foundly differentiated in vascular anatomy as well as in superficial structure. 
The purpose of the present paper is to consider the correlations between 
the number of bundles in the various regions of the seedling. The characters 
considered are (i) number of primary double bundles, of intercalary bundles, 
and of total bundles at the base of the hypocotyl, (2) number of bundles in 
the central region of the hypocotyl, and (3) number of bundles in the central 
region of the epicotyl. 
I. There is a substantial correlation between each of the three classes 
of bundles at the base of the hypocotyl and the number of bundles in the 
central region of the hypocotyl. In the normal seedlings the coefficients 
6 It has not seemed worth while to publish the tables upon which these very slight 
correlations are based. For purposes of comparison the series sectioned at Cold Spring 
Harbor and at Storrs are both given. 
