PLATE 2 



EXPLANATION OF FIGURES 



4 Portion of a cyst wall after 23 days. The nuclei of the changed inner layer of 

 fibroblasts have developed definite nucleoli, the cytoplasm is more definite than in 

 fig. 3, and the cells are suggestive of an embryonic type. X 800. 



5 Portion of a cyst wall after 26 days. The layer of cells bounding the degen- 

 erated ovarian tissue has become well defined, with a distinct basement membrane: 

 the character of the nuclei has again altered, they are smaller and the nucleoli 

 have disappeared. X 800. 



6 Portion of a cyst wall after 30 days, showing development of long rather ir- 

 regular cilia. The fibroblasts of the outer layers of the cyst are assuming the rest- 

 ing stage. X 800. 



7 Portion of a cyst wall after 98 days. The formation of ciliated epithelium is 

 complete and dividing walls have appeared between the cells. The nuclei are 

 smaller than in the stage represented in fig. 6. and the cilia are somewhat shorter 

 and more regular. X 800. 



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