102 



THli; PLANT CELL. 



larger masses of chromatin occur, termed net-knotS or karyosomes 

 (see Fig. 1, Chap. i.). The chromatin is so-called on account of its capacitj' 

 to take u\) stains like hcematoxylin and safranin. 



(e) Other structures which, like the chromatin, are able to take up 

 certain stains, are the nucleoli or plasmosomes. These lie in the 

 .•spaces between the linin network. There may be only one large nucleolus 

 present situated centrally. 



Fig. 76. — 1. A QuiES( ENT Cell from a Growing Root-tip. The nucleus 

 is situated centrally in the granular cytoplasm, and shoM's externally 

 the nuclear membrane, and internally the clear nuclear plasm, the 

 linin network upon which are seen at intervals the chromatin granules 

 and a few karyosomes ; two nucleoli are present. 



2. The Initial Phase or Mitosis (early prophase). The chromatin 

 granules have increased in size, and are becoming arranged in the 

 form of a definite chain upon the linin thread. 



