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HUTTONIAN THEORY. 247 



J' dony, and the fpherical fegments of the chalce- 

 S dony are imprinted on the planes of the fpar. 



Thefe appearances are confiftent with no notion 

 ^ of confoHdation that does not involve in it the 



fimiiltaneoiis concretion of the whole mafs ; and 

 fit fuch concretion cannot arife from precipitation 

 i from a folvent, but only from the congelation 



of a melted body. This argument, it muft be 

 Ik remarked, is not grounded on a folitary fpeci- 

 % men, (though if it were it might flili be perfect- 



ly conclulive), but on a phenomenon of whicl 

 there are innumerable inllances. 



220. According to this theory, veins v/er 

 filled by the injection of fluid matter from he- 

 ft/ low : and this account of them, which agrees fo 



well with the phenomena already defcribed, is 



confirmed by this, that nothing of the fubftances 



* which fill the veins is to be found any where at 



^ the furface. It is not with the veins as with 



the Itrata, where, in the loofe fand on the fliore, 

 and in the fnells and corals accumulated at the 

 bottom of the fea, we perceive the fame mate- 

 rials of- which thefe Itrata are compofed. The 

 fame does not equally hold of metallic veins : 

 f '' Look, fays Dr Hutton, into the fources of our 

 I mineral treafures ? Aik the miner from whence 

 ,| has come the metal in his veins ? Not from the 



earth or air above, nor from the flrata which 



the vein traverfes : thefe do 



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