{ 



• 



/^ 



Figure 20. A greatly enlarged photomicrograph of the egg- 

 nucleus only of the egg shown in Figure 19. This shows some 

 of the wonderful complexity of the nucleus. Notice particularly 

 the double strands of chromatin. 



Figure 21. The same as Figure 20 but now the long strands 

 of chromatin have become much shorter and denser so that they 

 lake a deeper stain. 





Figure 22. The chromosomes lying free in the cytoplasm and 

 beginning to separate, the first clearly marked step in the division 

 of the cell. 



