119 



cells it does (Figs, lb and c, 2b, 3, 4, 5, 11, 17), but there are other 

 instances in which it apparently does not (Figs. 2 a, 9, 12). 



In practically all cases the nuclear division is completed before 

 there is any indication whatever of a cytoplasmic one. In fact, not 



1 



a 



b 



c 



Figs. 1 aud 2 show nuclei from ectoderm cells in various stages of amitosis. 



Figs. 3 — 6. Ectoderm cells dividing amitotically. All of tbese are from a blasto- 

 derm taken four hours before laying. 



Figs. 7 — 12. Various entoderm cells in amitotic division. From blastoderms 

 taken from 2 — 4 hours before laying. 



