CONTENTS 



IX 



Section 2. On Increase in Size and Weight 



page 368 

 368 



2-1. Introduction 



2-2. The Existing Data 369 



2-3. The General Nature of Embryonic Growth 383 



2-4. The Empirical Formulae 389 



2-5. Percentage Growth-rate and the Mitotic Index 399 



2-6. Yolk-absorption Rate 405 



2 '7. The Autocatakinetic Formulae 408 



2-8. Instantaneous Percentage Growth-rate 420 



2-9. Growth Constants 434 



2-10. The Growth of Parts 440 



2-1 1. Variability and Correlation 455 



2-12. Explantation and the Growth-promoting Factor 460 



2-13. Incubation Time and Gestation Time 470 



2-14. The Effect of Heat on Embryonic Growth 498 



2-15. Temperature Coefficients 503 



2 • 1 6. Temperature Characteristics 515 



2-17. The Effect of Light on Embryonic Growth 533 



2-i8. The Effect of X-rays and Electricity on Embryonic Growth 536 



2-19. The Effect of Hormones on Embryonic Growth 538 



Section 3. 



3-1 

 3-2 



33 

 3-4 

 3-5 

 3-6 



37 

 3-8 



3-9 



On Increase in Complexity and Organisation 

 The Independence of Growth and Differentiation 

 Differentiation-rate 



Chemical Processes and Organic Form 

 The Types of Morphogenetic Action 

 Pluripotence and Totipotence 

 Self-differentiation and Organiser Phenomena 

 Functional Differentiation 

 Axial Gradients 

 Organised and Unorganised Growth 



3-10. Chemical Embryology and Genetics 



541 

 541 

 544 

 552 

 559 

 567 

 570 

 580 

 582 

 606 

 608 



VOLUM] 



Section 4. The Respiration and Heat-production of the Embryo 615 



4- 1 . Early Work on Embryonic Respiration 6 1 5 



4-2. Respiration of Echinoderm Embryos in General 623 



4-3. Rhythms in Respiratory Exchange 64 1 



6-2 



