1'AHT III --HISTOLOGY, OB THE MINUTE 

 STRUCTURE OF PLANTS 



CHAPTEB XXXI 

 THE CELL 



381. the cell as a WHOLE. All of the higher plants 

 are made up of a Large number of bodies <>r parts called 



cells. 11/' si art so minuti that, m m<>st cases, they ar< 



in risihh In I In tin l,i il i i/i . 



382. cells are of many forms. In general, plant 

 cells may 1"' assigned to some one of the following 

 forms : 



spherical, as in protococens (a minute alga i<> !" found 

 on damp walls and rocks), ami apple flesh; 



polyhedral, or many-sided, ;i- in pith of elder; 



tabular or flat, as in epidermis "t li .i 



cylindrical, a> in vaucheria, Bpirogyra; 



fibrous, a> col ton fibers : 



vascular, as the duets of wood , 



stellate, as in ill" interior of leaves ol lathyrus (sweet 

 pea ) and <>t her plant b. 



383. parts of a ckll i:..t\ living, growing cell 

 contains protoplasm (171), a colorless, Bemi fluid Bub 

 Btance, which is usually inclosed within a cell-wall. 

 Within iIm' wall. also, and Bometimes eloselj Burronnded 

 ii\ protoplasm, is h dense bod} known as the nucleus. 

 The nucleus nsuallj contains a smaller central part, or 



