A STATISTICAL STUDY OF MITOSIS AND AMITOSIS. 



229 



of amitosis, and the nineteen represented in Fig. 7 are cases some 

 of which one can find in every section. 



I have not been able to convince myself that there is any par- 

 ticular way in which these nuclei divide, on the contrary, the 

 details of their division vary considerably and there may be 

 others of which as yet I have no inkling. Figures such as 2, 5, 



18 



19 



Fig. 7. Nuclei from the ventral and lateral comparatively undifferentiated ento- 

 derm in the digestive zone of stage IV. and later stages. 



10, 13, suggest that the process of division may begin by the 

 formation of a lobe, and that this lobe may then be gradually 

 constricted off. The nuclei that one finds close together, such 

 as 16 and 17 often differ greatly in size suggesting that the lobes 

 from which they came may have been unequal, a condition 

 actually observed in many instances. Number 13 is a most 

 interesting and valuable nucleus, because it shows beyond doubt 

 a slightly chromatic, somewhat attenuated bridge connecting 



