8o MAINE AGRICULTL'RAL EXPERIMENT STATION. IQIS- 



Descriptiox of Figures. 



Figs. 3A and 3B. Photographs of normal ovaries of a healthy cow 

 about 6 years old. Xote in fig. 3A the large freshly formed corpus 

 luteum on the right. A smaller, involuting corpus luteum is seen at the 

 same level to the left in fig. 3A. In both figs. 3A and B very small, 

 far-regressed corpora lutea can be seen scattered at various points on 

 the ovary. (Slightly reduced below natural size). 



Figs. 4A and 4B. Photographs of cystic ovaries of the covvf Dorothy 

 of Orono. In both cases the ovary has been slit longitudinally and 

 opened out in order to show the size and distribution of the cysts. No 

 corpora lutea are visible nor were any to be seen on any part of these 

 ovaries. (Relative reduction as in Figs. 3A and B). 



Fig. 5. (Low power photomicrograph of a section through one of the 

 cystic ovaries of Dorothy of Orono. This shows at the top a normal 

 germinal epithelium and below it the fibrous connective tissue layer 

 (Schleimhautkorper) ; below this is the zona follicularis showing numer- 

 ous follicles in various stages of development. At the left at the level 

 indicated by x is seen an old atretic follicle scar of entirely normal 

 appearance (x 35). 



Fig. 6. Photomicrograph of a section of cystic ovary showing normal 

 interstitial cells loaded with secretion at a. (x 710). 



Fig. 7. Camera lucida drawing of a normal interstitial cell from the 

 cystic ovary. This figure shows the large, plump cell body and distinct 

 outline. Granules of secretion are scattered through the cytoplasm. This 

 cell contains relatively few of these granules of secretion, and is to be 

 contrasted in this particular with cells like those shown in Fig. 6 or Fig. 

 8. (x 2835). 



Fig. 8. Camera lucida, drawing of a normal interstitial cell from a 

 cystic ovary. This cell shows in comparison with Fig. 7, the elongated, 

 somewhat spindle-shape of the cell body due to pressure of surrounding 

 cells, and the extreme condition of loading of the cell-body with granules 

 of secretion. The lighter area in the lower part of the cell indicates the 

 position of the nucleus, the outline of which, however, cannot be seen 

 because of the secretion granules, (x 2835). 



Fig. 9. Photomicrograph of a normal Graafian follicle from cystic 

 ovary. This follicle is quite far advanced in its development, the liquor 

 folliculi already filling nearly a half of the follicle, (x 89). 



Fig. ID. Photomicrograph showing a normal very young Graafian 

 follicle from cystic ovary. In this case the cell body of the primitive 

 oocyte completely fills the Graafian follicle. There has been no forma- 

 tion of liquor folliculi, nor proliferation of the follicular epithelial cells. 

 A single row of nuclei of these follicular cells may be seen surrounding 

 the oocyte, (x 710). 



