443 



BOTANY. 



indicate the nodes and the yertical ranks of leaves) the sin- 

 gle bundles which descend from the leaves are shown to pass 

 through from ten to twelve internodes before uniting with 



Fig. 319.— Diagram showing the arrangement of the fibro-vascular bundles in 22 

 internodes of the stem of Iberis amaj'O.— After Nagefi. 



other bundles. It is seen, moreover, that there are running 

 through the stem five series of branching bundles, which are 

 not quite vertical, but slightly spiral. In Fig. 330 is shown 

 the appearance of an actual section of the stem taken be- 



