PEOTOZOA 7 



karyosome yields also eight small elongated bodies which are 

 identified as chromosomes. The stainable products of the 

 nucleus are thus the nucleolus and the chromosomes, together 

 forming the chromatin. 



The chromosomes occupy the equatorial region of the 

 spindle and (anaphase) are constricted and divided transversely. 



Prophase Anaphase 



Telophase 



Chromidial budding 



FIG. 3. Reproduction of Amoeba. Mitotic phases of division, and 

 reproduction by chromidial buds, after Wilson. 



The resulting eight pairs of chromosomes migrate apart along 

 the thread-like paths of the spindle. 



During the migration of the chromosomes towards each 

 pole the spindle elongates and (telophase the chromosomes 

 are received into the respective polar areas already occupied by 

 the halves of the nucleolus. In each area they are encircled 

 to form the daughter nucleus and, the cytoplasm constricting 

 along the plane of the equator, the two cells are separated. 

 Dr. Mary J. Hogue 1 found that an Amoeba obtained from the 

 oyster underwent the same changes during division. 



In addition to this manner of cell division, which is so 



1 1921. American Jour, of Hygiene, vol. 1. 



