428 



AMERICAN JOURNAL OF BOTANY 



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. 



T71/ME~ROUS SEEULJNGS 2/METtOUS 



456184-56 7 4 5 B 1 



PH/MARY UOUBLE BUNBLES 



DIAGRAM i. Regression of number of intercalary bundles on number of primary doublt 



bundles, at base of hypocotyl. 



