xii CONTENTS 



Section i6. Vitamins in Ontogenesis page 1359 



1 6- 1. Vitamin A 1359 



i6-2. Vitamin B 1 360 



16-3. Vitamin C 1 360 



16-4. Vitamin D 1 360 



16-5. Vitamins in Mammalian Development 1363 



1 6-6. Vitamin E 1365 



Section 17. Pigments in Ontogenesis 1368 



17-1. The Formation of Blood Pigments 1 368 



17-2. The Formation of Bile Pigments 1372 



17-3. The Formation of Tissue Pigments 1375 



17-4. The Pigments of the Avian Egg-shell 1376 



17-5. The Pigments of the Avian Yolk 137^ 



17-6. Egg-pigments of Aquatic Animals 1380 



17-7. Melanins in Ontogenesis 1 381 



Section 18. Resistance and Susceptibility in Embryonic Life 1383 



1 8- 1. Introduction 1383 



i8-2. Standard Mortality Curves 1383 



18-3. Resistance to Mechanical Injury 1385 



18-4. Resistance to Thermal Injury 1 388 



18-5. Resistance to Electrical Injury 1 392 



i8-6. Resistance to Injury caused by Abnormal /)H 1 397 

 18-7. Resistance to Injury caused by Abnormal Gas Concentrations 1399 



(non-Avian Embryos) 



1 8-8. Critical Points in Development 1 409 

 1 8-g. Resistance to Injury caused by Abnormal Gas Concentrations 1 4 1 4 



(Avian Embryos) 



i8-io. Resistance to Injury caused by Toxic Substances 1420 

 1 8- 1 1. Resistance to Injury caused by X-rays, Radium Emanation, 1 43 1 



and Ultra-violet Light 



Section 19. Serology and Inmiunology in Embryonic Life i444 



ig-i. Antigenic Properties of Eggs and Embryos 1 444 



19-2. The Formation of Natural Antibodies 144^ 



19-3. The Natural Immunity of Egg-white 1447 



19-4. Inheritance of Inamunity in Oviparous Animals ^451 



19-5. Serology and Pregnancy 1452 



19-6. Resistance of the Avian Embryo to Foreign Neoplasms 1454 



