CONTENTS xi 



Section 6-5. Water-content and Growth-rate page 883 



6-6. Water-absorption and the Evolution of the Terrestrial Egg 889 



6-7. Water-metabolism in Aquatic Eggs 906 



6-8. The Chemical Constitution of the Embryonic Body in Birds 911 

 and Mammals 



69. Absorption-mechanisms and Absorption-intensity 917 



6- 10. Storage and Combustion; the Plastic Efficiency Coefficient 934 



6-1 1. Metabolism of the Avian Spare Yolk 939 



6-12. Maternal Diet and Embryonic Constitution 943 



Section 7. The Energetics and Energy-sources of Embryonic Development 946 



7-1. The Energy Lost from the Egg during Development 946 



7-2. Energy of Growth and Energy of Differentiation 956 



7-3. The Relation between Energy Lost and Energy Stored 962 



7-4. Real Energetic Efficiency • 969 



7-5. Apparent Energetic Efficiency 972 



7*6. Synthetic Energetic Efficiency 98 1 



7-7. The Sources of the Energy Lost from the Egg 986 



Sections. Carbohydrate Metabolism 1000 



8-1. General Observations on the Avian Egg lOOO 



8-2. Total Carbohydrate, Free Glucose, and Glycogen lOOl 



8-3. Ovomucoid and Combined Glucose 1 007 



8-4. Carbohydrate and Fat 1014 



8-5. The Metabolism of Glycogen and the Transitory Liver 1018 

 8-6. Free Glucose, Glycogen, and Insulin in the Embryonic Body IO29 

 8-7. General Scheme of Carbohydrate Metabolism in the Avian Egg 1035 



8-8. Embryonic Tissue Glycogen 1 036 



8'9. Embryonic Blood Sugar 1039 



8- 10. Carbohydrate Metabolism in Amphibian Development 1043 



8*i I. Carbohydrate Metabolism of Invertebrate Eggs I047 



8-12. Pentoses 1 05 1 



8-13. Lactic Acid 1 051 



8-14. Fructose 1054 



Section 9. Protein Metabolism 1055 



9* I. The Structure of the Avian Egg-proteins before and after 1055 



Development 



9*2. Metabolism of the Individual Amino-Acids I059 



9-3. The Relations between Protein and non-Protein Nitrogen 1065 



9-4. The Accumulation of Nitrogenous Waste Products 10 76 



