xii CONTENTS 



Section 9-5. Protein Catabolism page 



9-6. Nitrogen-excretion; Mesonephros, Allantois, and Amnios 



9-7. The Origin of Protective Syntheses 



9*8. Protein Metabolism of Reptilian Eggs 



9-9. Protein Metabolism of Amphibian Eggs 



9' 10. Protein Metabolism in Teleostean Ontogeny 



9-11. Protein Metabolism in Selachian Ontogeny 



9* 1 2. Protein Metabolism of Insect, Worm, and Echinoderm Eggs 



9-13. Protein Utilisation in Mammalian Embryonic Life 



9-14. Protein Utilisation of Explanted Embryonic Cells 



9-15. Uricotelic Metabolism and the Evolution of the Terrestrial Egg 



Section 10. The Metabolism of Nucleins and Nitrogenous Extractives 



[O-i. Nuclein Metabolism of the Chick Embryo 



IO-2. The Nucleoplasmatic Ratio 



[0-3. Nuclein Synthesis in Developing Eggs 



[0-4. Creatinine, Creatine, and Guanidine 



Section 11. Fat Metabolism 



I • I . Fat Metabolism of Avian Eggs 



1-2. Fat Metabolism of Reptilian Eggs 



I •2- Fat Metabolism of Amphibian Eggs 



I -4. Fat Metabolism of Selachian Eggs 



1-5. Fat Metabolism of Teleostean Eggs 



1-6. Fat Metabolism of Mollusc, Worm, and Echinoderm Eggs 



1-7. Fat Metabolism of Insect Eggs 



1-8. Combustion and Synthesis of Fatty Acids in Relation to 

 Metabolic Water 



1 1 -9. Fat Metabolism of Mammalian Embryos 



Section 12. The Metabolism ofLipoids, Sterols, Cycloses, Phosphorus 

 and Sulphur 



1 2- 1. Phosphorus Metabolism of the Avian Egg 



12-2. Tissue Phosphorus Coefficients 



I2'3. Choline in Avian Development 



12-4, The Metabolism of Sterols during Avian Development 



1 2*5. The Relation between Lipoids and Sterols; the Lipocytic 

 Coefficient 



12-6. Cycloses and Alcohols in Avian Development 



12-7. Sulphur Metabolism of the Avian Egg 



12-8. Phosphorus, Sulphur, Choline, and Cholesterol in Reptile Eggs 



