CONTENTS 



Section 12-9. Lipoids and Sterols in Amphibian Eggs page 1237 



12-10. Lipoids, Sterols, and Cycloses in Fish Eggs 1239 



i2'ii. Phosphorus, Lipoids and Sterols in Arthropod Eggs 1241 



12-12. Phosphorus, Lipoids, and Sterols in Worm and Echinoderm 1243 



Eggs 



12-13. Lipoids and Sterols in Mammalian Development 1252 



Section 13. Inorganic Metabolism 1255 



[ 3- 1 . Changes in the Distribution of Ash during Avian Development 1 255 



32. Calcium Metabolism of the Avian Egg 1260 



33. Inorganic Metabolism of other Eggs 1 268 

 3-4. The Absorption of Ash from Sea-water by Marine Eggs 1 27 1 

 3-5. The Ani on/Cation Ratio 1 2 74 

 3-6. Inorganic Metabolism of Mammalian Embryos 1277 

 3-7. Calcium Metabolism of Mammalian Embryos 1285 



Section 14. Enzymes in Ontogenesis 1289 



4-1. Introduction 1 289 



4-2. Enzymes in Arthropod Eggs 1290 



4-3. Enzymes in Mollusc, Worm, and Echinoderm Eggs 1293 



4-4. Enzymes in Fish Eggs 1 295 



4-5. Enzymes in Amphibian Eggs 1300 



4-6. Enzymes in Sauropsid Eggs 1303 



4-7. Changes in Enzymic Activity during Development 1307 



4-8. Enzymes of the Embryonic Body 1 3^0 



4-9. Enzymes in Mammalian Embryos 13 12 



4-10. The Genesis of Nucleases 1326 



4-11. Foetal Autolysis 1 329 



Section 15. Hormones in Ontogenesis 1335 



5-1. Introduction 1335 



5-2. Adrenalin ^337 



53. Insulin 1342 



5-4. The Parathyroid Hormone 134^ 



5-5. The Hormones of the Pituitary 134^ 



5-6. Secretin 134^ 



5-7. Thyroxin 134^ 



5-8. Oestrin and other Sex Hormones • 1353 



VOLUM 



