Plate HI. 



FIG. 13. "Grit cells," (sclerenchyma), from the Dahlia root. A, Group of cells: 

 B, thin walled cells surrounding the sclerenchyrmi; C and E. opening of canauln 

 the cell wall; D, canals In section. Fig. A. (x300.) Fig. B. (xlOO.) 



MB."; 



Fio. 14. Transect ion of tin- le:if 

 M"BT. of PIHIW suleextri* A, Cavity of the 

 ' ' gland; B, thick wslled epidermis; O, 

 parenchyma of the mesophyll; D, 



bundle sheath; E, large thin- walled 



cells lining the gland. (.\300.) 



usually more or less disorganized, lining the gland 



