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HUTTONIAN THEORY. 



453: 



built by Tiberius in the ifland of Caprea, are 

 now entirely covered by the fea. 



Thus, it appears that the level of the fea is 

 finking in the more northern latitudes, and ri- 

 iing in the Mediterranean, and it is evident 

 that this cannot happen by the motion of the 

 fea itfelf.' The parts of the ocean all com- 

 municating with one another, cannot rife in 

 one place and fall in another ; but, in order to 

 maintain a level furface, muft rife equally or fall 

 equally over the whole of its extent. If, there- 

 fore, we place any confidence in the preceding 

 obfervations, and they are certainly liable to no 



ri 



objection, either from their own nature or the 

 character of the obfervers, we mull confider it 



jk "^wr to ke yai as demonflrated, that the relative change of le- 

 vel has proceeded from the elevation or depref- 

 fion of the land itfelf. This agrees well with 

 the preceding theory, v/hich holds, that our 

 continents are fubjed: to be aded upon hy the 

 expanfive forces of the mineral regions ; that 

 by thefe forces they have been adually raifed 

 up, and are fuftained by them in their prefent 

 fituati 



ion. 



398. According to fome other fads ftated by 

 the fame ingenious author, it appears, that on 

 the coaft of Italy the progrefs of the fea in 

 afcending, or of the land in defcending, has not 



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been 



