326 



ILLUSTRATIONS OF THE 



il 



given here, both from C 



and 



Daouria, the granites containing quartz-cryftals 



veins that interfed the primary fchif. 



from 



d are therefore, on every hypothelis, of 



f( 



d 



fubfequent to that fchift 



But 



5 not follov^r from thence, that they are lefs 

 ancient than the great mafles of unllratified gra- 

 nite ; with thefe lad they are mod probably 

 coeval, nor can there be any reafon for thinking 



cryftallization of quartz a mark of more 



m 



recent formation than th^t of feltfpar. 



the 



3. Stratijicatiofi of Granite. 



292. What are the various modes in which 

 granite exiils, is a queftion not abfohitely de- 

 cided among mineralogifts. i. 



That it exifts 



fchiftofe ftone of a fiffile texture, in gneifs and 

 nned granite, is on all hands admitted, though 



in this ftate the name of gran 



generally 



hheld fro 



That it exilts often with 



out any 



gether i 

 3. That 

 ilrata, h 

 of its e 



idication of a fiffile texture, and alto- 

 ftratified, is likewife acknowledged. 



in veins, interfering the 



is found in veins, inte; 



been fliown above. The only mode 



ft 



fubjed to difp 



th 



at 



m 



which it is faid to be ftratified in its out- 



ward 



