Stages of nuclear division of amoeba shown by the jelly method of in-vitro 

 staining with Unna's polychrome methylene blue. 

 1, 2. The so-called "resting " nucleus. 

 3-8. Some stages in the division of the nucleus. 



9. An equatorial plate can occasionally be distinguished. 



10, 11. The nucleus breaking up into smaller portions. 



12. A dividing nucleus which has teen liberated from the amoeba by treat- 

 ment with alkali. 



