XX CONTENTS. 



CHAPTER XX. Page 



Parthenogenesis, or Virginal Reproduction — Fundamental 



Facts 243 



CHAPTER XXI. 



Theory of Parthenogenesis 249 



CHAPTER XXII. 



Geneagenesis in Plants — Relation of the Animal to the 



Vegetable Kingdom 261 



CHAPTER XXIII. 



General Considerations — Conclusion 276 



