342 
AMERICAN JOURNAL OF BOTANY 
[Vol. 8. 
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PTfl7^A'Ry JIOUBLE BUNULES 
Diagram 2. Regression of number of bundles in central region of hypocotyl and in 
central region of epicotyl on number of primary double bundles at base of hypocotyl in di- 
merous seedlings. Empirical means represented by solid dots for hypocotyl and by circles 
for epicotyl. 
The correlation coefficients between the two classes of bundles which 
have been recognized at the base of the hypocotyl and the total number of 
basal bundles (i.e., the sum of the number of primary double bundles and 
the number of intercalary bundles in the base of the hypocotyl) and the 
number in the central region of the hypocotyl, appear in table i. 
