x CONTENTS 



CHAPTER VI 



PAGE 

 FERTILISATION . . . . . . . . . . .187 



The Hereditary Effects of Fertilisation Telegony On Gametic 

 Selection and the Conditions Favourable for the Occurrence of 

 Fertilisation Conjugation in the Protozoa The Supposed 

 Chemotactic Properties of Spermatozoa and their Relation 

 to the Phenomena of Fertilisation Artificial Aids to Fertilisa- 

 tion Artificial Parthenogenesis. 



CHAPTER VII 



THE ACCESSORY REPRODUCTIVE ORGANS OF THE MALE AND THE 



MECHANISMS CONCERNED IN INSEMINATION .... 227 



The Vesiculae Seminales The Prostate Gland Cowper's Glands 

 The Copulatory Organ The Mechanisms of Erection, 

 Ejaculation, and Retraction. 



CHAPTER VIII 



THE BIOCHEMISTRY OF THE SEXUAL ORGANS 263 



The Female Generative Organs : Mammals, Birds, Invertebrates 

 The Male Generative Organs : The Semen The Chemistry 

 of the Spermatozoon. 



CHAPTER IX 



THE TESTICLE AND THE OVARY AS ORGANS OF INTERNAL SECRETION . 303 



The Correlation between the Testis and the other Male Organs and 

 Characters The Correlation between the Ovary and the other 

 Female Organs and Characters The Factors which determine 

 the Occurrence of Heat and Menstruation The Function of 

 the Corpus Luteum The Supposed Internal Secretion of the 

 Uterus The Correlation between the Generative Organs and 

 the Ductless Glands General Conclusions regarding the 

 Internal Secretions of the Ovary and the Testis The Effects 

 of Castration upon the General Metabolism. 



CHAPTER X 



FCETAL NUTRITION : THE PLACENTA ....... 357 



Part I. The Placenta as an Organ of Nutrition i. Historical 

 Survey ii. Structure and Functions of the Epithelial In- 

 vestment of the Villi iii. The Decidua. 



Part II. The First Stages of Pregnancy : Placental Classification 

 i. The Ovarian Ovum. ii. The Fertilised Ovum and its 

 Coverings. iii. The Uterine Mucosa. iv. Placental Classi- 

 fication. 



Part III. The Fietal Membranes, the Yolk-sac, and the Placenta 

 i. General Anatomy of the Fretal Membranes. ii. The Nutri- 

 tive Importance of the Yolk-sac (Marsupialia, Ungulata, 

 Carnivora, Proboscidea and Hyrax, Rodentia, Insectivora, 



