THE ANIMAL CELL 25 



6, The loops of chromatin collected at each pole are re- 

 constructed into a coil which then passes gradually into the 

 resting stage at the new position, a membrane is formed, and 

 the daughter nucleus is complete. The nuclear spindle dis- 



FIG. 8. 



FIG. 8. Indirect or mitotic division (diagrammatic); A, resting mother nucleus; B, coil stage, 

 with the centrosomes separating; C, D (metaphase), and E, stages in the division of the chromo- 

 somes (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, and the formation of the dividing wall: c, centrospheres; cl, chromatin coil; chr, chro- 

 mosomes; nu., nucleus; , nucleolus; sp, nuclear 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. 



