ILLUSTRATIONS 



1. Diagram illustrating the " Wellenbewegung " hypothesis - - 62 



2. Transverse section through Fallopian tube, showing folded epithelium and 



muscular coat - - 70 



3. Reproductive organs of ewe - - 71 



4. Section of a cornu of a rabbit's uterus - 72 



5. Cross-section through cervical canal of human uterus 73 



6. Section through wall of vagina of monkey (upper part) 75 



7. Section through wall of vagina of monkey (lower part) 76 



8. Section through mucosa of human uterus, showing pre-menstrual congestion 77 



9. Section through mucosa of human uterus, showing extravasation of blood 79 



10. Section through mucosa of human uterus, showing sub-epithelial hsema- 



tomata - - 81 



11. Section through mucosa of human uterus, showing bleeding into the 



cavity during menstruation - - 82 



12. Section through mucosa of human uterus during the recuperation stage - 83 



13. 14. Sections through pnxestrous uterine mucosa of dog - - - 93, 94 



15. Section through edge of mucosa of dog during an early stage of recuperation 96 



16. Section through portion of mucosa of dog during recuperation period - 97 



17. Section through portion of mucosa of dog during late stage of recuperation 98 



18. Section through uterine mucosa of bitch forty-eight days after the end of 



protestrum (retrogressive stage of pseudo-pregnancy) - 99 



19. Section through portion of prooestrous uterine mucosa of rabbit, showing 



glandular activity 100 



20. Section through uterine mucosa of rabbit nine days after sterile coition - 101 



21. Section through uterine mucosa of rabbit twenty-four days after sterile 



coition - - 102 



22. Section through portion of uterine mucosa of sheep, showing black 



pigment formed from extravasated blood - 105 



23. Section through ovary of cat - 109 



24. Section through ovary of adult dog - 110^ 



25. Section through ovary of rabbit - 111 



26. Section through ovary of pig embryo 112 



27. Cortex of pig embryo, showing germinal epithelium, etc. - 113 



28. Various stages in the development of the Graafian follicle (rabbit) - 115 

 29-32. Developing ova from ovary 116, 117 



33. Ovary at birth, showing primordial follicles - 1 ] 8 



34. Young ob'cyte or egg surrounded by a single layer of f ollicular epithelial cells 121 



35. Young human Graafian follicle 122 



36. Human ovum at termination of growth period 123 



37. Human ovum examined fresh in the liquor folliculi 124 



38. Recently ruptured follicle of mouse - - 138 



39. Early stage in formation of corpus luteum of mouse 139 



40. Late stage in formation of corpus luteum of mouse - - 140 



41. Corpus luteum of mouse fully formed 141 



42. Discharged follicle of rabbit nineteen hours after coition - 143 



43. Section through old corpus luteum - - 148 



44. Section through follicle in early stage of degeneration - 150 



