6o 



ROOT STRUCTURE 



FIG. 34. Portion of the formative region of the root taken at a in Fig. 33: 

 r, root cap; v, cells which by repeated division add new cells to end of root 

 and to inside of root cap. Note the numerous dividing cells and their uni- 

 formity in size. I. D. Cardiff. 



FIG. 35. Portion of the region of elongation of the root taken at b in Fig. 

 33. Note the larger size of the cells, increase in cell sap as indicated by the 

 larger vacuoles and absence of cell division; e, epidermis; c, cortical region; 

 p, central region. I. D. Cardiff. 



