195 



also found. In the débris the nucleus is seen either to have its 

 chromatin in irregular lumps, or to be completely broken up into 

 minnte fragments. 

 (Aceto-corrosive). 

 Fig. 15. Normal and degenerating uterine epithelium showing the fat globules; 

 o. The fat globules are small and found both internally and extern- 

 ally to the nucleus. 



b. The cells are cubical, the nuclei rounded, the fat globules larger. 



c. A later stage in degeneration, the fat globules are rnuch larger. 

 Fig. 16. A subepithelial cell with iron-granules of various sizes. 



Fig. 17. Subepithelial tissue, and blood capillaries from a uterus of about 

 eight days. 



A megalokaryocyte has been carried into one of the capillaries. 

 (Aceto-corrosive). 



Fig, 17«. A mitosis in a subepithelial cell. 

 (Flemming). 



Fig. 18. A small portion of the lateral (omphaloidean) proliferation of sub- 

 epithelial tissue from a uterus of the same age as that figured in 

 Fig. 17. 



This figure shows how the nuclei of these cells may approximate 

 in size and structure to those of the megalokaryocytes. 

 The cytoplasm is delicately fibrillar, and there is also a fibrillar 

 inter-cellular substance. 

 (Flemming). 



Fig. 19. Part of the capsularis, from the edge of the placenta on about the 

 fourteenth day. 



To the left (outside) is flattened subepithelial tissue. Inside this 

 are megalokaryocytes containing granules; two nuclei are in a 

 state of degeneration. Bet ween the cells are lacunae with maternal 

 blood corpuscles. 



Inside again is the distal wall of the yolk-sac, the epithelium of 

 which lies on a much thickened basement membrane. 

 (Foa). 



Fig. 20. Cells from the richly folded epithelium of the proximal wall of the 

 yolk-sac ; 



a. Showing granules, possibly of zymogen. 



(Foa). 



b. Showing fat globules. 



(Flemming). 

 Fig. 21. A megalokaryocyte ingesting blood corpuscles, leucocytes, and débris; 

 the cytoplasm stains faintly, and is readily distinguishable from 

 that of the surrounding subepithelial cells. 



From the omphaloidean trophoblast of an embryo of about seven 

 days. 



(Aceto-corrosive). 

 Fig. 22. Phagocytic allantoidean trophoblast of the same embryo. The 

 blood corpuscles appear to be ingested in clumps. 



