THE ANIMAL CELL 



25 



radial appearance about the centrosomes, and even the centro- 

 some itself, may disappear or become inconspicuous. 



c ^-c sp..^;«^ D 



-sp. 



Fig. 8. Indirect or mitotic division (diagrammatic); A, resting mother nucleus; B, spireme 

 stage, with the centrosomes separating; C, D (metaphasej, and E, stages in the division of the 

 chromosomes (the cell wall is not shown in these three drawings); F, diastroid (anaphase) stage; 

 G and H show the return of the daughter nuclei to the coil and to the resting condition, and division 

 of the cytoplasm by the formation of the dividing wall: c, centrospheres ; d, chromatin coil; chr, 

 chromosomes; km., nucleus; n, nucleolus; sp, spindle; w, cell wall. 



Questions on the figure. — What structures possessed by the original cell are 

 divided in this process? In what order? Why is this termed "indirect" division? 

 Which is the more common, the direct or the indirect? Can you see any special 

 gain secured by this method? Describe the behavior of the nucleolus and the 

 nuclear membrane by comparing this with other figures in reference books. 



