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state: their having existed being proved, only by the discovery 

 of their fossil remains. 



4th. That the traces of very few of those species which now exist 

 can be discovered in the wreck of a former world. 



5th. That even in rocks of the newest formation, and in alluvial 

 strata, which are comparatively of but modern deposition, 

 the remains of extinct animals are as frequently to be found, 

 as in what are termed Transition Rocks, (those which are sup- 

 posed to contain the first traces of organic remains.) 



6th. That there appears to have been no line of separation between 

 the creation of species now extinct, and of those now exist- 

 ing ; since not only the remains of extinct species, but per- 

 haps of extinct genera, are found, with the remains of species 

 very similar to, if not exactly agreeing with, species known in 

 a recent state. 



7th. That many of the pebbles, found in gravel pits, on the shores 

 of rivers, and on the sea beach, do not appear to have been 

 bowldered down to the form in which they are now found; but 

 that, on the contrary, their present forms are precisely those 

 which they, at first, derived from the silicious impregnation of 

 different animals, which existed in the former ocean. 



8th. That judging from the original delicacy of structure in these 

 bodies, and from the little injury which they have sustained, it 

 appears reasonable to suppose, that this solidification was ef- 

 fected, in several instances, previous to the removal of the 

 waters from their former bed. 



