CONTENTS 



CHAPTER I P AQB 



Introduction 1 



CHAPTER II 



The Recapitulation Theory in Bioloqt: A Sketch of 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 



— >f' 9. " Ontogeny is a Short and Rapid Recapitulation 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 



~*3>. Those of Embryonic Resemblance 33 



— ■ a 9c. Those of Comparative Morphology 37 



^5" 13. Recapitulation and the Physiology of Development 41 



^" 14. Biological Opinion Regarding Recapitulation 49 



" 15. Review and Summary 57 



CHAPTER III 



Human Infancy and Recapitulation 



Sec. (^l) Human Embryogeny 62 



" 2. The Theory of Infancy 64 



" 3. Recapitulation and Human Infancy 77 



" 4. Cultural Recapitulation 93 



t Conclusion , 



CHAPTER IV 

 99 



v 



