i 



4 



445 



ILLUSTRATIONS OF THE 



tion has been in the fea rather than in the land, 

 and that the former has actually defcended to a 

 lower level. The imagination naturally feels 

 lefs difficulty in conceiving, that an unliable 

 fluid like the fea, which changes its level twice 

 every day, has undergone a permanent depref- 

 iion in its furface, than that the land, the terra 

 Jirma itfelf, has admi ted of an equal elevation. 

 In all this, however, we are guided much more 



by fancy than reafon ; 

 or elevate the abfolute 



for 



in order to deprefs 

 of the fea, by a gi- 



ven quantity, in any one place, we muft deprefs 

 or elevate it by the fame quantity over the 



whole furface of the 

 iieceffity exifts with : 

 depreffion of the land 

 5 feet all round the 



earth 

 fped: 



/hi 

 th 



fuch 



To make the fea fubiid 



6 



ft 



f Great B 



ecelTary to difplace a body of water 3 



1, It 

 feet 

 The 



deep over the whole furface of the ocean, 

 quantity of matter to be moved in that way is 

 incomparably greater than if the land itfelf were 



to be elevated : for though 



■ly 



times lefs in fpecific gravity, it is as much great- 

 er in bulk, as the furface of the ocean is greater 

 than that of this illand. 



393. Befides, the fea cannot change its level, 

 without a proportional change in the folid bottom 



on which it refts. Though there be reafon to fup- 



pofe 



P 



ofet 



( 



sn 



di^ 



are 

 tliat 



tl 



i 



hang 



felf, a: 

 i-ation 



lyloc 



to vai 

 , tofac 



i 



394 



ferent 



certaii 

 that t 

 treatii 



Th 



lliele 



»ash 

 ktxi 



ciiratf 

 itcet 



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