CONTENTS 



XV 



Section 20. Biochemistry of the Placenta page 14.^6 



20-1. Introduction 1 45" 



20-2. General Metabolism of the Placenta 145^ 



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 1481 



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 149^ 



21-4. Mesonephros and Placenta 1 493 



21-5. Colostrum and Placenta ^497 



21-6. Placental Transmission and Molecular Size 1497 



21-7. QuaHtative Experiments on Placental Permeability 1 505 



21-8. The Passage of Hormones 15^^ 



2 1 -9. Factors Governing Placental Transmission 15^2 



2I-IO. Quantitative Experiments on the Passage of Nitrogenous 15 14 



Substances 

 2 1 -I I. Quantitative Experiments on the Passage of Phosphorus, Fats, 1520 



and Sterols 

 2i'i2. Quantitative Experiments on the Passage of Carbohydrates 1525 



2i*i3. Quantitative Experiments on the Passage of Ash 1 52 7 



21-14. The Passage of Enzymes 15^9 



2i*i5. The Unequal Balance of Blood Constituents 1530 



Section 22. Biochemistry of the Amniotic and Allantoic Liquids 1534 



22-1. Introduction 1 534 



22-2. Evolution of the Liquids ^535 



22-3. Avian Amniotic and Allantoic Liquids 1 537 

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



toic Liquids 



22-5. Maternal Transudation and Foetal Secretion 154^ 



22-6. Interchange between Amniotic and Allantoic Liquids 15^2 



22-7. Vernix Caseosa 1 5^4 



Section 23. Blood and Tissue Chemistry of the Embryo 1565 



23-1. Blood 1565 



23-2. Lung 1 57 1 



23-3. Muscle 1574 



