CONTENTS 



PREFACE 



LIST OF ILLUSTRATIONS 



V 



CHAPTER I. 



INTRODUCTORY 



CHAPTER 11. 



THE REPRODUCTIVE ORGANS IN THE HIGHER ANIMALS 15 



The Male Organs ........ 16 



The Female Organs ........ 25 



The Mammary Glands 33 



The Maturation of the Germ Cells . . . .35 



Coition .......... 38 



CHAPTER III. 



THE MAMIVIALIAN SEXUAL CYCLE 

 The Menstrual Cycle 

 Puberty and the Climacteric . 



41 

 51 



58 



CHAPTER IV. 



PREGNANCY 



Development of the Embryo 

 Attaciement of the Embryo 

 Changes in the Maternal Organism 

 Duration of Pregnancy 



00 

 63 

 70 

 74 

 75 



CHAPTER V. 



PARTURITION. PUERPERILTVI. LACTATION 

 The Cause of Parturition 

 The Puerperium . . • 



Lactation ....••• 

 Parturition in the Lower Mammals 



30417 



77 

 80 

 81 

 82 

 85 



