THE SKELETON OF THE PLANT 



43 



complexity as its life continues. In every plant growth 

 proceeds continuously or intermittently so long as life lasts. 



FIG. 40. DIAGRAM OF STEM OF DICOTYLEDON: AT THREE AGES. 



A, Young condition showing the first formed vascular bundles a. B, A little older 

 stage, showing preparation for formation of new conducting tissue, c, Older 

 stage. The bundles have become larger and new ones (a) have been intercalated 

 between them. 



Every year new branches or twigs with their associated leaves 

 are constantly produced. With such continuous increase 

 of size, new conducting tissue must be formed. The skeleton 



