56 



REPRODUCTION 











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KIM 



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Fisnre 14. Diagram of the process of division of the cell nucleus. In the 

 first picture the spherical nucleus is seen in the cytoplasm that surrounds it; 

 the net-like arrangement of the chromatin is indicated. In the second the chro- 

 matin is in a continuous band, this being the first stage m the division pro- 

 cess In the middle picture the chromatin has resolved itself into dehnite chro 

 mosomes which are dividing at the middle of the spindle. In the fourth picture 

 the newly formed chromosomes are migrating toward the poles of the spindle. 

 The last picture shows the formation of the daughter nuclei and the beginning 

 of the new cell wall. The spindle fibers soon disappear. 



