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1 7. Corpus luteum, of ovulation (non-pregnant sow), hematoxylin and eosin. X 650. 



18. Wall of ripe Graafian follicle, hematoxylin and eosin. X 400. (A) Theca interna. 



19. Specimen No. 70, showing a Graafian follicle ruptured during pregnancy. Hematoxylin and eosin. X 3. 



(a) The ruptured follicle. (A) An unruptured follicle, (c) A corpus luteum of pregnancy. 



20. Wall of follicle shown in Figure 19. Hematoxylin and eosin. X- ca. 100. 



(a) Granulosa. (A) Theca interna. 



21. Specimen No. 136, a Graafian follicle showing partial accessory lutein-cell formation. Hematoxylin and eosin. X 3. 



(a) Point at which the accessory lutein formation occurs. 



22. Showing the area marked a. Fig. 21, enlarged 70 diameters. Hematoxylin and eosin. X 70. 



23. Four cells of the granulosa of the same specimen, showing ring-like vacuoles in the cytoplasm like those seen in lutein 



cells. Mallory's stain. X600. 



