158 ELEMENTS OF STRUCTURAL BOTANY. 



260. Whilst looking at the parts of plants just sub- 

 mitted to examination, it must have struck you that the 



interior of the cell 

 presents a very dif- 

 ferent appearance in 

 different cases. The 

 Potato section, for 

 example, is not at all 

 like the Moss-leaf 

 section in the matter 

 of cell-content l s, and 

 the cells of the Elder- 

 pith appear to be 

 quite empty. We 

 shall discuss these 

 differences presently. 

 In the meantime let 

 us study the appear- 

 Fic . 215 ance of some cells 



taken fresh from some part of a plant where growth is 

 actually going on say the point of a new rootlet. If our 

 section is taken 

 near enough to 

 the point we shall 

 get cells which 

 have just been ^^ 



formed. Such a Fig. 217. 



section is very well shown in Fig. 218. Here the cells 

 are seen to be completely filled with liquid having a 



Fig. 215. Cells from leaf of a Moss containing protoplasm and chlorophyll- 

 granules. 

 Fig. 216. Hair from Petunia leaf. Fig. 217. Hairs from Geranium leaf. 



