146 BULLETIN OF THE 



10. Nuclear division may be followed by division of the cell, but not 

 often immediately. The cell divides by the formation of a cell wall, 

 either with or without constriction. 



11. The binucleate condition of cells is independent of their size; 

 but, iu general, the size of the nucleus, or nuclei, is proportional to the 

 size of the cell. 



12. Elongated cells of the serosa are generally binucleate. The 

 nuclei almost invariably lie in the long axis of the cell, near the ends. 



13. A binucleate cell becomes trinucleate by division of one of its 

 nuclei, and quadrinucleate by the division of both. Very rarely the 

 division is tripartite, and the three nuclei are produced simultaneously 

 from a single one. 



14. Division of the amniotic nuclei is also amitotic, but the constric- 

 tion is supplemented by a septum at the equator of the elongated 

 nucleus. 



15. There is apparently no rearrangement of the chromatic substance. 

 Nucleoli are apportioned equally to the daughter nuclei. 



16. Division of the nucleus is quickly followed by division of the cell, 

 so that binucleate cells are not common. 



17. The epithelium of the ovarian capsule is composed of small 

 hexagonal or rectangular cells, which frequently contain two or more 

 nuclei. 



18. The nuclei are very similar to those of the amnion, but usually 

 contain only one nucleolus. 



19. Nuclear division is amitotic, and precisely like that of the amni- 

 otic nuclei. Each daughter nucleus contains one nucleolus. 



20. No instance of cell division was observed. 



21. All three membranes undergo degeneration as the embryos ap- 

 proach maturity. 



22. In the serosa the cytoplasmic reticulum becomes more distinct, 

 and is seen to radiate from the nuclei. The cell-walls become stainable. 



23. The chromatic substance of the nuclei becomes grouped into 

 dense masses ; the reticulum and nucleoli become more distinct. The 

 outlines of the nuclei become irregular. 



24. As degeneration proceeds, the cytoplasm frequently forms a halo 

 of radial structui'e around the nucleus. 



