n 



ORGANOGRAPHY. 



Fig. 178. 



Fig. 178. The Dragon Tree of Teneriffe (Draccena Draco), now destroyed. 



Palm, and probably also of some other monocotyledonous plants, 

 not the slightest dependence can be placed upon it in any par- 



Flg. 180. 



Fig. 179. 



Fig. 179. Transverse section of the stem of the common Reed. a. Cavity 

 closed at the bottom hy a partition. 6. Ring indicating the point 



where the leaf was attached. Fig. 180. Section of the underground 



stem of a species of Sarsaparilla. a. Epidermal tissue, b, c, d. The 

 cortical portion, e. "Woody zone. /. Medulla or pith. 



ticular instance, for there are frequently several rings produced 

 on the stems of monocotyledonous plants in one year, and these 

 again often disappear after having existed for a certain period. 



