July, 1921] THE SEEDLING OF PHASEOLUS VULGARIS 347 
TOTAL BU/VULES 
Diagram 5. Regression of number of bundles in central region of hypocotyl and in 
central region of epicotyl on total number of bundles at base of hypocotyl in -trimerous 
seedlings. Empirical means represented by solid dots for hypocot yl and by circles for 
epicotyl. 
