33 



ILLUSTRATIONS OF THE 



an unllratified texture, which is only found in 

 rocks highly cryftallized, and fuch as have en- 

 dured the mod violent adtiori of the minerali- 

 zing powers. 



301. Now, though the ftratification of granite, 

 or the mixture of the ftratified with the unllra- 

 tified rocks of that genus, is not only reconcile- 

 ahle with the principles of the Huttonian geolo- 



•y, but might even have been deduced as a corol- 



lary from thofe principles, before it was adual- 

 ly obferved, it may be confidered as inconfiilent 

 with the theory of granitic veins that has juft 

 been given. A ftratum, though foft or fluid, 

 could not invade the furroimding ftrata with 

 violence, nor fend out veins to penetrate into 

 them. It might, if ftrongly compreiTed 

 another ftratum lefs fluid than itfelf, fill up 

 any filTures or cracks that were in that other. 



N 



but this would hardly produce fuch large 

 veins, and of fuch confiderable length, as often 

 penetrate from the granite into the fchiftus, 

 nor could it give rife to any appearance of di- 

 fturbance. If, therefore, veins were found pro- 

 ceeding from fuch ftratified granite as that of 

 Chorley Foreft or Lammermuir, I ftiould think, 

 that the explanation of them was ftill a dejide- 



The Neptunian theory af 

 infiltration would indeed be as applicable to 



L ■ 



them 



ratum in geology 



