LIST OF PLATES 



Plate Facing Page 



I. REPRODUCTION BY BUDDING, IN HYDRA 8 



n. SEXUAL REPRODUCTION IN HYDRA 9 



III. FERTILIZATION AND DIVISION OF THE EGG OF THE 



SEA URCHIN, AS SEEN IN SECTIONS 18 



IV. DEVELOPMENT OF THE SEA URCHIn's EGG, FROM 

 LIVING SPECIMENS 19 



V. THE HUMAN OVARIES, OVIDUCTS, AND UTERUS S4 

 VI. REGNER DE GRAAf's ORIGINAL PICTURE OF THE 



GRAAFIAN FOLLICLE, 1672 S5 

 VII. THE PRIMATE OVARY AND EGG 38 

 VIII. GROWTH OF THE FOLLICLE IN THE RAT 89 

 IX. THE CORPUS LUTEUM 44 

 X. THE OVIDUCT ( FALLOPIAN TUBe) AND THE TRANS- 

 PORT OF THE EGG 45 

 XI. DIVISION OF THE RABBIt's EGG, FROM LIVING SPEC- 

 IMENS 56 

 XII. IMPLANTATION OF THE EMBRYO IN THE RHESUS 



MONKEY AND IN MAN 57 



XIII. THE VAGINAL CYCLE IN THE RAT 74 



XIV. CASTRATE ATROPHY 76 

 XV. THE EFFECT OF ESTROGENIC HORMONE ON THE 



VAGINA 84 



XVI. THE EFFECT OF ESTROGENIC HORMONE ON THE 



UTERUS 85 



XVII. PROGESTATIONAL PROLIFERATION OF THE UTERUS 108 



XVIII. THE EFFECT OF PROGESTERONE ON THE UTERUS 



AND EMBRYOS OF THE RABBIT 109 



XIX. X-RAY PHOTOGRAPH OF THE HUMAN SKULL, SHOW- 

 ING LOCATION OF THE PITUITARY GLAND 142 

 XX. HUMAN INFANT AT BIRTH, WITH PLACENTA 143 

 XXI. THE UTERUS OF THE RHESUS MONKEY AT SUCCES- 

 SIVE STAGES OF THE CYCLE 148 



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