CONTENTS 



INTRODUCTION BY JANE MAIENSCHEIN 



PREFACE 



CHAPTER 1. 



The Beginning of Embryo logical Investiga- 

 tions in Russia in Lomonosov's Epoch 



CHAPTER 2. Preformation or New Formation? 



CHAPTER 3. Kaspar Friedrich Wolff and Substantiation 

 of the Theory of Epigenesis 



CHAPTER 4. The "Theory of Generation" of K. F. Wolff 



CHAPTER 5. Wolff's Treatise "On the Formation of the 

 Intestine" 



CHAPTER 6. Wolff's Terato logical' Works 



CHAPTER 7. The Work of Wolff: "On the Special 

 Essential Power" 



CHAPTER 8. The Ideology of Wolff 



CHAPTER 9. The Theory of Epigenesis in Russia at the 

 End of the 18th Century 



CHAPTER 10. The Development of Embryology in the Epoch 

 of the Struggle of Russian Empirical 

 Science against Naturphilosophie 



CHAPTER 11. Louis Tredern — The Forgotten Embryologist 

 of the Beginning of the Nineteenth Century 



CHAPTER 12. The Study of the Embryonic Membranes of 

 Mammals: The Investigations of Ludwig 

 Heinrich Bo j anus 



1 

 14 

 19 



35 

 43 



49 



67 



89 

 105 



115 

 121 



141 



205 



237 



in 



