6 CONTENTS 



CHAPTER PAGE 



XI. SOME MISCELLANEOUS EXAMPLES OF HETEROGENESIS . 199 



XII. THE HETEROGENETIC ORIGIN OF CILIATED INFUSORIA . 230 



XIII. THE HETEROGENETIC ORIGIN OF CILIATED INFUSORIA [fOn- 



tinued) ....... 258 



XIV. CONCLUSION : THE CONGRUITY OF THE EVIDENCE . .286 



Appendix — 



on the great importance from the point of view 

 of medical science of the proof that bacteria 

 and their allies are capable of arising de novo. 315 



Index 333 



