104 



ri.AA'T LIFE. 



in pairs, a phloem (bast) bundle and a xylem (wood) bundle 

 being placed side by side, thexylem occupying the side next 



Fitt. i ic).— Portion of a transverse section of the stem of flax, m, pith; //.secondary 

 xyiern forming a woody cylinder; pk, phloem ; />, bundles of mei hanical tissue (fibers) 

 among the thin-walled cells, tin- two sorts making up the cortex; ./, the epidermis. 

 Magnified about J5 diam. — After Frank. 



P 



Fig. 120. — Transverse section of a bundle pair from the stem of .1 begonia. 'The shaded 

 pari is the xylem bundle; the small irregular cells above are the phloem bundle; 

 between them is a zone "t urmi.itiiii: 1 • inn tern), the stelar cambium, 



ulii. Ii extends also right and left oi the bundle pair. The radius of the section passes 

 through (V; C, next the center. Magnified 150 diam.— After Haberlandt. 



the center of the stem, and the phloem the side next the 

 surface (figs. 1 1 1, 120). The number and position of these 



