CONTENTS 



PAGE 

 INTRODUCTION . .... . . . . 



CHAPTER I 



THE BREEDING SEASON . . . . . . . . 4 



Protozoa Ccelenterata Nemertea, &c. Annelida Arthropoda 

 Mollusca Echinodermata Cephalochordata Pisces 

 Amphibia Reptilia Aves Mammalia Periodicity of 

 Breeding, &c. 



CHAPTER II 



THE (ESTROUS CYCLE IN THE MAMMALIA 35 



Monotremata Marsupialia Rodentia Ungulata Cetacea 

 Carnivora Insectivora Cheiroptera Primates. 



CHAPTER III 



THE CHANGES THAT OCCUR IN THE NON-PREGNANT UTERUS DURING 



THE CESTR.US CYCLE 75 



The Cycle in Man Monkeys Lemurs Insectivora Carnivores 

 Ungulates. 



CHAPTER IV 



CHANGES IN THE OVARY OOGENESIS GROWTH OF FOLLICLES 



OVULATION FORMATION OF CORP RA LUTEA AND ATRETIC 



FOLLICLES THE SIGNIFICANCE OF THE PROCESTROUS CHANGES 



IN THE UTERUS . . . . . . . . .113 



Dev lopment of Ovary and Oogenesis Maturation and Ovulation 

 The Formation of the Corpus Luteum The Atretic Follicle 

 Superf oetation Formation of Ova The Significance of the 

 Procestrous Changes. 



CHAPTER V 



SPERMATOGENESIS INSEMINATION 165 



Structure of Spermatozoa Seminal Fluid Movements of Sper- 

 matozoa Insemination. 



ix 



