CONTENTS 



PASE 

 INTEODUOTION . . J 



CHAPTER I 



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



Protozoa — Coelenterata — ^Nemertea, kc. — ^Annelida — ^Arthropoda 

 — Mollusea — Eohinodermata — Cephaloohordata — Pisces — 

 Amphibia — Reptilia — Aves — Mammalia — Periodicity of 

 Breeding, &c. 



CHAPTER II 



THE CESTROtJS CYCLE DT THE MAMMALIA ..... 35 



Monotremata — Marsupialia — ^Rodentia — Ungulata — Cetacea — 

 Carnivora — Insectivora — Cheiroptera — Primates. 



CHAPTER III 



THE CHANGES THAT OCCUK IN THE NON-PBEGNANT UTEBUS DUEING 



THE OSSTEOUS CYCLE 75 



The Cycle in Man — ^Monkeys — Lemurs— Insectivora — Carnivores 

 — Ungulates. 



CHAPTER IV 



CHANGES IN THE OVAEY — OOGENESIS QBOWTH OF FOLLICLES 



OVtHiATION — FOEMATION OF 00EP:BA LUTEA AND ATBETIC 



FOLLICLES THE SIGNIFICANCE OF THE PROOSSTEOUS CHANGES 



IN THE UTEEUS . . . . . . . . .113 



Dev lopment of Ovary and Oogenesis — Maturation and Ovulation 

 — The Formation of the Corpus Luteum — ^The Atretic FoUicle 

 ^Superfoetation — Formation of Ova — The Significance of the 

 Prooestrous Changes. 



CHAPTER V 



SPERMATOGENESIS INSEMINATION . . . . .165 



Structure of Spermatozoa — Seminal Fluid — Movements of Sper- 

 matozoa — ^Insemination. 



