CONTENTS 



CHAPTER I PAGB 



INTRODUCTION 1 



CHAPTER II 



THE RECAPITULATION THEORY IN BIOLOGY: A SKETCH OP ITS HISTORY 



SEC. 1. Other Names for the Theory 5 



" 2. Anticipations of the Recapitulation Idea 5 



" 3. The "Theory of Types" 7 



" 4. Von Baer's Law: The Law of Embryonic Resemblance 8 



" 5. The Correspondence Stated as Between Developmental Stages 

 of Existing Animals and the Succession of Adult Forms of 



Extinct Representatives. Agassiz 9 



" 6. Embryology and Darwinism 11 



" 7. Darwin 11 



" 8. The Developmental-ancestral Correspondence Clearly Enunci- 

 ated: Fritz Muller 14 



" 9. " Ontogeny is a Short and Rapid Recapit ulation of Phylogeny" : 



Haeckel 14 



" 10. Herbert Spencer 20 



" 11. The Laws of Acceleration and Retardation 23 



" 12. The Facts of Recapitulation 28 



a. Those of Palaeontology 29 



b. Those of Embryonic Resemblance 33 



c. Those of Comparative Morphology 37 



" 13. Recapitulation and the Physiology of Development 41 



" 14. Biological Opinion Regarding Recapitulation 49 



" 15. Review and Summary 57 



CHAPTER HI 

 HUMAN INFANCY AND RECAPITULATION 



SEC. 1. Human Embryogeny 62 



" 2. The Theory of Infancy 64 



" 3. Recapitulation and Human Infancy 77 



" 4. Cultural Recapitulation 93 



CHAPTER IV 



CONCLUSION 99 



