146 CYCLIC CHANGES IN THE OVARIES AND UTERUS OP THE SOW, ETC. 



DESCRIPTIONS OF PLATES. 



Comparison of the plates will be facilitated by use of the tabular synopsis, page 144. 



PLATE 1. 



FIG. 3. Section of the corpus luteum about 10 days after ovulation, showing fully developed granulosa lutein cells. Bouin's 

 fluid, Mallory's connective-tissue stain. Photograph. X210. (Figure 12, plate ?, shows higher mag- 

 nification of the same preparation.) 



Fio. 4. Corpus luteum about 13 days after ovulation, showing reticulum stained by Bielschowsky's silver-impregnation 

 method. Photograph. X210. 



Fio. 5. Corpus luteum (degenerating), about 17 days after ovulation, showing increase in reticulum. Bielsehowsky. 

 Photograph. X210. (Same animal as fig. 15, plate 2.) 



Fio. 6. Corpus luteum, degenerating, about 20 days after ovulation. Bouin, iron hematoxylin. Photograph. X25. 

 a, blurring of delimitation between lutein tissue and the capsule, as described in text. 



Flo. 7. Corpus luteum in well-advanced degeneration, about 4 weeks after ovulation, illustrating complete disappearance 

 of the granulosa lutein cells. Bouin, iron hematoxylin. Drawing. X80. 



Fio. 8. Corpus luteum (degenerate) about 7 weeks after ovulation, showing numerous fat-bearing cells presumably derived 

 from the theca interna. Osmium tetroxide fixation without other stain. Photograph. X 150. 



PLATE 2. 



Fio. 9. Ovary of a sow in cestrua. Natural size, m.f., mature follicles. 

 FIG. 10. Ovary of a sow about 8 days after ovulatiob. Natural size. 



c. 1., corpora lutea of the latest ovulation (8 days old). (See fig. 3, plate 1, and figs. 12, 13, plate 2.) 

 r. c. 1., retrogressing corpora lutea of the next previous ovulation (8+21 days), i. /., immature follicles. 

 FIG. 11. Ovary of a sow about 17 days after ovulation. Natural size. 



c. I., corpora lutea of the latest ovulation (17 days old), now retrogressing. (See fig. 14.) 

 /., Graafian follicles enlarging preparatory to the next ovulation, due in about 4 days. 

 Fio. 12. Corpus luteum about 10 days after ovulation. Bouin, Mallory's connective- tissue stain. X700. 

 gr. c. I., granulosa lutein cell. 

 th. I. c., theca lutein cell. 

 Fio. 13. Corpus luteum about 10 days after ovulation. Osmium tetroxide fixation without additional staining, to show fat. 



X700. gr. 1. c., granulosa-lutein cell. th. I. c., theca lutein cell. 

 Fio. 14. Corpus luteum in early degeneration about 17 days after ovulation, showing collapsed capillaries and degenerating 



lutein cells. Bouin, Mallory's stain. X700. 

 cap., collapsed capillary blood-vessels. 

 Fio. 15. Corpus luteum in slightly later degeneration about 17 days after ovulation (not the same animal as fig. 14). Most 



of the cellular debris has disappeared. Bouin, Mallory's stain. X700. 

 th. I. c., persistent cell, presumably a theca lutein cell. 

 Fio. 16. Corpus luteum in early degeneration about 17 days after ovulation (same animal as fig. 14). Osmium tetroxide for 



fats. X700. 



th. I. c., persistent fat-bearing cells, presumably theca lutein cells. 



Fio. 17. Uterus, showing mouth of gland, to demonstrate that cilia are present in the glands but not on the surface epithe- 

 lium. Bouin, iron hematoxylin. X330. 



Fio. 18. Uterus, showing ciliated epithelium in glands lying at the base of the mucosa, near the muscularis. Bouin, iron 

 hematoxylin. X330. 



PLATE 3. 



Flo. 19. Section of uterus showing blood-vessels. Ink injection, carmine stain. Photograph. X10. 



Fio. 20. Uterus during o?strus. Bouin, iron hematoxylin. Photograph. X10. 



FIG. 21. Uterus about 8 days after ovulation. Bouin, iron hematoxylin. Photograph. X10. 



FIG. 22. Uterus about 15 days after ovulation. Bouin, iron hematoxylin. Photograph. X10. 



FIG. 23. Portion of uterine epithelium with subjacent arteriole about 17 days after ovulation, showing migration of poly- 



morphonuclear neutrophil leucocytes from the blood-vessel. Bouin, carmine. Photograph. X500. 

 pm., polymorphonuclear leucocytes. 

 FIG. 24. Portion of uterus about 7 days after ovulation, showing accumulation of eosinophtil leucocytes in the stroma. 



Photograph. XI 20. 

 eos., eosinophil leucocytes. 



PLATE 4. 



Sections of sow's uterus at various periods of the cycle. Fixed in Bouin's fluid, cut at 5 micra, 



and stained with iron hematoxylin. Drawn at uniform magnification of GOO diameters. 

 FIG. 25. Uterus during oestrus. 



p. m., polymorphonuclear leucocyte en route through the epithelium. 



mil., mitotic figure in dividing cell. 

 FIG. 26. Uterus during a-strus. 



v. d. t vacuolar degeneration. 



p. m., polymorphonuclear leucocytes at base of epithelium. 



Fio. 27. Uterus (non-pregnant) about 6 days after ovulation. mil., mitotic figure in dividing cell. 

 FIG. 28. Uterus (non-pregnant) about 8 days after ovulation. p. ., pseudocrypt. i. c., intercalar cell. 

 FIG. 29. Uterus (non-pregnant) about 11 days after ovulation. 

 FIG. 30. Uterus (non-pregnant) about 16 days after ovulation. 



mil., mitotic figure in dividing cell. v. d., vacuolar degeneration. 

 FIG. 31. Uterus (pregnant) about 8 days after ovulation. 

 Fio. 32. Uterus (pregnant) 14 to 15 days after ovulation. 

 Fio. 33. Uterus (pregnant) 18 to 20 days after ovulation. cho., chorion of embryo, partly detached. 



