; 



33^ 



ILLUSTRATIONS OF THE 



tunity {hall occur of verifying the one or 

 other by adual obfervation. 



300. The ftratification of granite, thoug 



the 



mad 



no part of Dr H 



; 



fyfteni 



1 It 

 does 



hy no means embarrafs his theory with any 

 new difficulty. Rocks, of which the parts 



are highly cryflallized, are 



dy admitted 



as belonging to th 



ftrata 



d are 



fied in marble, gneifs, and veined g 



the two lall 

 but 



h 



not 



exempli- 

 inite. In 



ftratification. 



a fchiftofe, united with a cryftallized ftruc- 

 , and the effects of depolition by water, and 



f fluidity by fi 



are 



tainly nowhere more 



Angularly combined. The ftratification of thefe 

 fubftances is therefore more extraordinary than 

 even that of the moft highly cryftallized gra- 



Neither the one nor the other can be ex- 

 plained but by fuppofing, that while fuch 

 degree of fluidity was produced by heat, as e: 



nite. 



a 



abled the body when it cooled to 



th 



whol 



yft 



mafs was kept in its place by gr 



prefTure ading on all fides, fo th 



was preferved as 



nally 



the fhape 



th 



fea 



g 



to it 



As we cannot, however, fuppofe, that 

 fity of the heat, or the fufibility of the 



fubftance through ait the parts of a ft 



precifely th 



fame 



we 



may 



pe6l to find in 



the fame ftratum, or in the fame body of ftrata, 

 that in fome parts the marks of ftratification are 



completely 



