CONTENTS 



PAGE 

 INTRODUCTION ......... 1 



CHAPTER I 



THE BREEDIKG SEASON ......... 4 



Protozoa Coelenterata 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 OJSTR ,US CYCLE ........ 75 



The Cycle in Man Monkeys Lemurs Insectivora Carnivores 

 Ungulates. 



CHAPTER IV 



CHANGES IN THE OVARY OOQENESIS GROWTH OF FOLLICLES 



OVULATION FORMATION OF OORP RA LUTEA AND ATRETIC 



FOLLICLES THE SIGNIFICANCE OF THE PROO3STROUS CHANGES 



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



Dev lopment of Ovary and Oogenesis Maturation and Ovulation 

 The Formation of the Corpus Luteum The Atretic Follicle 

 Superf cetation Formation of Ova The Significance of the 

 Prooastrous Changes. 



CHAPTER V 



SPERMATOGENESIS INSEMINATION . . . . . . .165 



Structure of Spermatozoa Seminal Fluid Movements of Sper- 

 matozoa Insemination. 



