Growth 



323 



these tissues may be determined, in considerable measure, 

 by the conditions of growth. 



Many meristematic cells, especially cells of the pri- 



* 



- 



' ' 



H 



FIG. 82. Nuclear and cell division in the root of corn : cell with promi- 

 nent resting nucleus (.4) ; prophases of nuclear division, spirera (B) 

 and chromosome (C) stages ; bipolar spindle (D) ; early (E) and late 

 (F) anaphases ; telophases (G) and first evidence of cell-plate ; location 

 of cell-wall clearly defined (H}. [After Curtis.] 



mordial meristem, are so situated and conditioned that 

 growth or increase of the protoplasmic content takes 

 place, and at the same time the size of the cell may in- 

 crease; this condition, however brought about, usually 

 results in cell division. 



