428 
AMERICAN JOURNAL OF BOTANY 
[Vol. 8, 
The lines for the regression of number of primary double bundles on 
number of intercalary bundles are represented with the empirical means on 
diagram 2. These figures show that, with the exception of the normal 
plants of lines 98, 139, and 143, the number of primary double bundles 
decreases slightly as the number of intercalary bundles increases. The 
rate of decrease is somewhat greater in the abnormal than in the normal 
plants. 
TTim ETIOUS SEEULIA/GS U/nETlOUS SEEUL/A/GS 
^5674 
PR/mm nouBLE bunules 
Diagram i. Regression of number of intercalary bundles on number of primary double 
bundles, at base of hypocotyl. 
