x CONTENTS 



CHAPTER VII 



1'AWK 

 THE ACCESSORY REPRODUCTIVE ORGANS OF THE MALE AND THE MECHANISMS 



CONCERNED* IN INSEMINATION - - 239 



The Vesicula? 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 - 273 



The Female Generative Organs : Mammals, Birds, Lower Vertebrates, 

 Invertebrates The Male Generative Organs : The Semen The 

 Chemistry of the Spermatozoon The Biochemistry of Fertilisation. 



CHAPTER IX 



THE TESTICLE AND THE OVARY AS ORGANS OF INTERNAL SECRETION 320 



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 Influence of the Reproductive Organs 

 and the Effects of Castration upon the General Metabolism. 



CHAPTER X 



FCETAL NUTRITION : THE PLACENTA - 393 



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

 II. Structure and Functions of the Epithelial Investment 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 Classification. 



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

 I. General Anatomy of the Foetal Membranes II. The Nutritive 

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

 Proboscidea and Hyrax, Rodentia, Insectivora, Primates) -III. The 

 Placenta in Indeciduata (Ungulata, Lemuroidea, Cetacea, Sirenia, and 

 Edentata) IV. The Placenta in Deciduata (Carnivora, Proboscidea, 

 Hyrax, Rodentia, Insectivora, Cheiroptera, Primates) V. General 

 Considerations of Fcetal Nutrition and the Placenta : A . The Plan 

 of Placental Formation. B. The Nature of the Trophoblastic 

 Activity. 



CHAPTER XI 



THE CHANGES IN THE MATERNAL ORGANISM DURING PREGNANCY - 514 



I. The Stimulus for the Maternal Changes during Pregnancy II. Changes 

 in the Metabolism of the Mother during Pregnancy : A . The Source 

 of the Materials transferred to the New Organism. B. The Body- 

 Weight during Pregnancy. C. The Protein Metabolism in Pregnancy. 

 D. The Carbohydrate Metabolism in Pregnancy. E. The Metabolism 

 of Fats in Pregnancy. F. The Acid-Base Equilibrium in Pregnancy. 

 <?. The Metabolism of Metals and Salts in Pregnancy. H. Respira- 

 tory Exchange and Energy Metabolism during Pregnancy. 

 7. Summary. K. Analogy oetween Metabolism of Pregnant and 

 Tumour-bearing Animals III. The Changes in the Maternal Tissues 

 during Pregnancy. 



