tttlTTONIAN THEORY. 



65 



M r 



this procefs was going forward, and would cry- 

 ilalJize, as in other cafes of congelation, from the 

 fides toward the interior* Ther^ is the more rea- 

 fon for fuppofing this to have been the cafe, that 



the fam 



for 



f coating is 



fte 



obferved on 



the infide of clofe cavities, which are, neverth 

 lefs, fo conftruded, as to afford a demonftratic 

 that no chemical folvent 



was 



included 



them, (§ 74.). Some veins, it muft alfo be 

 fidered, may have been filled by fucceffiv 

 jedions of melted matter, and this would 1 

 rally give rife to a variety of feparate 



incrufta- 



tions *. 



60, In the view now given of metallic veins, 

 they have been confidered as traverfing only the 

 Itratified parts of the globe. They do, however, 

 occafionally interfed the unflratified parts, par- 

 ticularly the granite, the fame vein often conti- 

 nuing its courfe acrofs rocks of both kinds, with- 

 out fuffering any material change ; and, if we 



.r 



no 



have hitherto paid 

 ftance, it is becaufe the order purfued i 

 eflay required, that the relation of the v( 

 ftratified bodies fhould b,e firft treated of. 

 fides, the fads in th 



rcum- 

 n this 



B 



whethe 



contained 



natural hiltory of veins, 

 fl:ratified or unflratified 



E 



rock 



* See fome farther remarks on this fubjed at No 



IE 



XIII, 



