XVlll CONTENTS. 



19. Of former Systems of Geology ..................... ....... 57 



20. Diversities of the Geological Systems, and their Causes 63 



21. Statement of the Nature and Conditions of the Problem 



to be solved ........................ . ..................... 64 



22. Of the Progress of Mineral Geology ..................... 67 



23. Of the Importance of Extraneous Fossils, or Petrifac- 



tions, in Geology ................. . ..................... 6-9 



24. High importance of investigating the Fossil Remains of 



Quadrupeds. ............................................ 71 



25. Of the small Probability of discovering new Species of 



the larger Quadrupeds ................................ 74 



26. Inquiry respecting the Fabulous Animals of the Ancients 85 



27. Of the Difficulty of distinguishing the Fossil Bones of 



Quadrupeds ............................................. 97 



28. Results of the Researches respecting the Fossil Bones 



of (Quadrupeds ............. ..... ........ . ............. ... 109 



29. Relations of the Species of Fossil Bones, with the Stra- 



. ta in which they are found ......... . ................... Ill 



-30. Proofs that the extinct Species of Quadrupeds are not 



Varieties of the present existing Species ............ 118 



31. Proofs of the recent Population of the World, and that 



its present Surface is not of very ancient Formation 133 



32. Proofs that there are no Human Bones in the Fossil 



State ...................................................... 120 



*32. Proofs from Traditions, of a great Catastrophe, and 



subsequent Renewal of Human Society .............. 145 



33. Proofs derived from several Miscellaneous Considera- 



tions ............................................. . ...... .. 161 



34. Concluding Reflections .................. , ................. 165 



SUPPLEMENT, being an Extract from the Researches of 



M. de Prony, on the Hydraulic System of Italy ; 

 containing an Account of the Displacement of that 

 Part of the Coast of the Adriatic which is occupied 

 by the Mouths of the Po .................. , ........... 175 



