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HUTTONIAN THEORY. 



455 



wards the poles 



Th 



the notion of Frifi, as 



has been already remarked, and he fuggefts, 

 that this rife of the fea may be owing to a flight 



But 



acceleration in the earth's diurnal motion, 

 there are fads which fhew, that between the tro- 

 pics the relative level of the fea and land has 

 funk, and is lower at prefent than it was at 

 fome former period, probably not extremely re- 



mote 



Th 



opinion of Frifi, therefore 



un 



fupported by obfe 



and. as has been al 



ady fhewn, cannot be juftified from theory 

 Between the tropics, 



iflands are formed from 



the 



mulation of 



d it is the 



peculiarity of thofe regions, to produce rocks that 

 have not paiTed through the ufual procefs of 

 mineral confolidation *. The iflots, however, 

 which are thus formed, mull have their bafes 

 laid on a folid rock, though perhaps at a great 

 depth ', and it is not probable, that after they 

 are once raifed above the furface of the fea, 

 they can ftill rife farther, except by fome eleva- 

 tion of the rock which ferves as their founda- 



Ff4 



tion. 



Dr Fofter, in his Voyage round the World, (vol 

 1.6.) gives an inflance in thje South Sea Iflands, ' 



rock 



raifed forty feet above the level of the fea 



