ckir<c 





cutf 



Fig. io. — Diagrams illustrating the process of indirect cell division 

 or mitosis. 



A, the resting cell : the nucleus shows a nuclear membrane {nn. ;;/), 

 chromatin (chr) arranged in loops united into a network (the latter 

 shown on the right side only), and two nucleoli {nu') : near the nucleus 

 is an astrosphere (s), containing a centrosome (c) and surrounded by 

 radiating protoplasmic filaments. 



B, The chromatin has resolved itself into distinct loops or chromo- 

 somes {ikr) which have divided longitudinally : the nuclear membrane 

 has begun to disappear : there are two astrospheres and between them 

 is seen the commencement of the nuclear spindle (sp). 



c, The nuclear membrane has disappeared : the chromosomes are 



