584 
Holden and Bexon .— On the Seedling 
the production of three bundles at the'base of the petiole, so that six bundles 
enter the epicotyl at each node (Fig. 40), these alternating with the six 
bundles entering the stem from the node above (Fig. 42). 
Figs. 56-9. Transverse sections of a petiole, showing a single asymmetrically situated medullary 
bundle (Fig. 56) which at a lower level unites with half the adaxial bar (Fig. 57). Figs. 58 and 59 
show differing methods of bundle fusion on opposite sides of the same petiole. (Camera lucida 
outlines x 20.) 
SECOND 
EFICOT 
NODE 
FIRST W 
EPICOT 
'NODE 
COT. 
NODI 
Fig. 60. Diagrammatic representation of the vascular system of the young seedling shown as if 
cut through in the intercotyledonary plane and spread out flat. M., midribs ; L., laterals. 
The bundles derived from each pair of leaves, with the exception of 
those at the first epicotyledonary node, travel down through two internodes. 
At the base of the second internode each bundle bifurcates to admit of the 
