MATURATION OF THE GERM-CELLS 



167 



FIG. 39. Diagram of the phases of cell-division by mitosis. (After Parker.) 

 Highly magnified. 



A, cell about to divide ; B, division ol the chromatin into chromosomes. 

 The centrosome has divided into two ; C, formation of a spindle (sj>. ) between 

 the two centrosomes ; D, equatorial arrangement of the chromosomes ; E, 

 commencing migration of the split chromosomes towards the poles of the 

 spindle ; F, G, H, formation of daughter-nuclei and division of the cell ; 

 I, formation of a cell-plate between the daughter-cells. 



c , centrosome ; chr, chromosomes ; c.pl, cell - plate ; cw, cell - wall ; ', 

 nucleoli ; num, nuclear membrane ; s, aster ; sj>, spindle. 



