CONTENTS 



CHAPTER VI 



PAGE 



187 



FERTILISATION ....■.-■••■ 



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 Fertihsa- 

 tion — ^Artificial Parthenogenesis. 



CHAPTER VII 



THE ACCESSORY REPRODUCTIVE ORGANS OF THE MAIE AND THE , 



MECHANISMS CONCERNED IN INSEMINATION .... 227 



The Vesiculse Seminales— The Prostate Gland— Cowper's Glands 



The Copulatory Organ — The Mechanisms of Erection, 



Ejaoiilation, 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 OP 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 



PCETAL 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 VilU — ^iii. The Deoidua. 



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 Foetal Membranes, the Yolk-sac, and the Placenta 

 — i. General Anatomy of the Pcetal Membranes. — ii. The Nutri- 

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

 Carnivora, Proboscidea and Hyrax, Rodentia, Insectivora, 



