FIG. 147. Diagram of nuclear division. 



A, resting-cell, with cytoplasm (zk), centrosphere (csph) which contains two centro- 

 somes, nucleolus (kk), and chromatin (chr), the last distributed in the linin net- 

 work ; the whole nucleus is surrounded by a nuclear membrane. B, the chromatin 

 united in a coiled thread ; the centrosphere divided into two and giving off rays 

 which unite the two. C, the nuclear spindle (lap) formed, the rays more 

 strongly developed, the nuclear membrane (fan) in process of dissolution, the 

 chromatin thread divided into eight similar chromosomes (chrs), the rays 

 561 



