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HUTTONIAN THEORY. 



171 



believe been ever found ; though fome inftances 

 will be hereafter mentioned, where granite con- 

 tains fragments of other Hones, viz. of different 

 kinds of primary fchiitus. 



To the inftances of fand involved in primary 

 fchiftus, I might have added many from the 

 rocks of that order on the coaft of Berwickfliire, 

 of which mention is fo often made in thefe 

 Illuftrations ; but I wilhed to draw the evi- 

 dence from thofe rocks that are moft unequivo- 



t 



cally primary, and to which the Wernerian di- 

 ftindion of intermediate could not poffibly be 

 applied. 



If any one affert, as M. de Luc has done, 

 that fand is a chemical depofite, a certain mode 

 of cryftaHization which quartz fometimes af- 

 fumes, let him draw the line which feparates fand 

 from gravel ; and let him explain why quartz, in 

 the form of fand, is not found in mineral veins, 

 in granite, nor in bafaltes, that is, in none of the 

 fituations where the appearances of cryftalliza- 

 tion are moft general and beft afcertained. 



Note v. 



10. 



Tranfportation of the materials of the fl rata, 



155. The great tranfportation or travelling of 

 the materials of the ftrata, fuppofed hy Dr Hut- 

 ton, 



