CONTENTS 



CHAPTER "VT 



PEETIUSATION 



PAGE 



187, 



227 



The Hereditary Effects of Pertilieation — Telegony — On Gametic 

 Selection and the Conditions Favourable for the Occurrence of 

 Fertilisation — Conjugation in the Protozoa — ^The Supposed 

 Chemotaetio Properties of Spermatozoa and their Belation 

 to the Phenomena of Fertilisation— Artificial Aids to Fertilisa- 

 tion — Artificial Parthenogenesis. 



CHAPTER VII 



THE ACCESSOBY REPEODUOTIVE OBGAIfS OF THE MALE AND THE 

 MECHANISMS CONCEENBD nST nfSBMnSTATION" .... 



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

 ^The Copulatory Organ — The Mechanisms of Erection, 

 Ejaculation, and Retraction. 



CHAPTER VIII 



THE BIOCHEMISTRY OF THE SEXtrAl 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 tfie 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 Metabohsm. 



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 Ovumi and its 

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

 fication. 



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

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

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

 Carnivora, Proboscidea and Hyrax, Rodentia, Insectivora, 



