CONTENTS 



Section 20. Biochemistry of the Placenta page 1456 



20-1. Introduction 1 45^ 



20-2. General Metabolism of the Placenta ^^45^ 



20-3. Placental Respiration 1 46 1 



20*4. Nitrogen Metabolism of the Placenta 1 462 



20-5. Carbohydrate Metabolism of the Placenta* 14^9 



20-6. Fat and Lipoid Metabolism of the Placenta 1472 



20-7. Placental Enzymes 1 48 1 



Section 21. Biochemistry of the Placental Barrier 1485 



2 1 • I . The Autonomy of the Foetal Blood 1 4^5 



21-2. Evolution of the Placenta ^4^7 



21-3. Histotrophe and Haemotrophe ^492 



2 1 -4. Mesonephros and Placenta 1493 



21-5. Colostrum and Placenta ^497 



21-6. Placental Transmission and Molecular Size 1 497 



21-7. Qualitative Experiments on Placental Permeability 1505 



21-8. The Passage of Hormones 1 5 1 1 



2i'9. Factors Governing Placental Transmission 15^2 

 2 1 -ID. Quantitative Experiments on the Passage of Nitrogenous 15 14 



Substances 

 2 1 • 1 1 . Quantitative Experiments on the Passage of Phosphorus, Fats, 1 5 2 O 



and Sterols 

 2 1 •12. Qnuantitative Experiments on the Passage of Carbohydrates 1525 



21-13. Quantitative Experiments on the Passage of Ash 1 52 7 



21-14. The Passage of Enzymes 1 529 



21-15. The Unequal Balance of Blood Constituents 1 530 



Section 22. Biochemistry of the Amniotic and Allantoic Liquids 1 534 



22-1. Introduction 1 534 



22-2. Evolution of the Liquids 1535 



22-3. Avian Amniotic and Allantoic Liquids 1537 

 22-4. Amount and Composition of Mammalian Amniotic and Allan- 1539 



toic Liquids 



22-5. Maternal Transudation and Foetal Secretion 1546 



22-6. Interchange between Amniotic and Allantoic Liquids 1562 



22-7. Vernix Caseosa 1564 



Section 23. Blood and Tissue Chemistry of the Embryo 1565 



23-1. Blood 1565 



23-2. Lung ^ 1571 



23-3. Muscle 1574 



