

5 



it. 





-ill 



( 



ii[. i 



i 



ii 



!l 



P 



HUTTONIAN THEORY. 



497 



mater 



;als thus afforded, new horizontal ilrata 

 are perpetually formed at the battom of the fea. 

 If this be true, and if the alternations of decay 



and renovation have been often 



peated 



it may hav 



the figure of the earth, whatever 



ginally been 



ft be brought 



libriu 



gth to coincide with the fpheroid of equi 



435. Here it is neceffary to remark, that the 

 expreffions,/j-7/r^ of tbe earth, 2.n^furface of the 

 earth, are each of them occafionally taken in two 

 different fenfes. 



The furface of the earth 



mofl ob 



4 



fenfe, is that which bounds the whole earth and 



includes all 



;qualities : it is a furface 



tremely irregular, rifing to the tops of the moun- 

 tains, defcending to the bottoms of the valleys, 

 and having the continuity of its curvature often 



pted, or fuddenly changed 



Th 



may 



be called the acitial furface, and the figure bound' 

 ed by it, the adlual figure, of the earth. 



The furface of the earth 



if 



e that is every where h( 



fame which water afiumes when at reft 



another fenfe, i 



and is th 



Th 



fuperfi 



is deterniined by the cir- 



cumftance of its being conftantly perpendicul 

 to the diredion of gravity 



it is the furface 



marked out by levelling, and may be fuppc 

 fed to be continued from the f^a, through th 



I 



interior 



I. 



