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HQTTONIAN THEORY. 



447 



^ 



pofe that fuch changes in the bottom do adual- 

 Ij take place, yet they are probably mucii flower 

 and more imperceptible than thofe which we 



are here conlidering. 



It is evident, therefore, 

 that the fimpleft hypothefis for explaining thofe 

 changes of level, is, that they proceed from the 

 motion, upwards or downwards, of the land it- 

 felf, and not from that of the fea. As no ele- 



depreffion of th 



fea 



can take 



but over the whole 



level cannot be affeded 



by local caufes, and is probably as little fubjed 

 to variation as any thing to be met with on the 

 furface of the globe. 



394. Other obfervations, how^ever, made on dif- 



r-- 'Mlietkiil ferent fhores from the preceding 



gi 



g 



certainty to this conclufion 



d make it clear 



that the motion or change which we are now 

 treating of is not to be afcribed to the fea itfelf. 

 The obfervations juft mentioned prove, that 

 the level of the North Sea is lower now than it 

 was heretofore ; but it appears, that in the Me- 



diterranean, the oppolite takes pi 



Very 



curate obfervations made by Manfredi, render 

 it certain, that the fuperficies of the Hadriatic 

 was higher about the middle of the lad century, 

 than toward the beginning of the Chriftian sra! 



Some repairs that v/ere carrying on in th 

 ihedral church of Ravenna, in 



e 



ca- 



the yegr 173 



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f 



afforded 



