Ch- XV.] OF THE PRIMARY ROCKS. 369 



In concluding our remarks on this important subject, we 

 venture to express a hope that if the objections advanced are 

 not altogether unanswerable, yet, that they are of sufficient 

 weight to prove that the apparent movements which the pri- 

 mary rocks are supposed to have undergone, are not esta- 

 blished on a satisfactory basis : since it cannot be admitted 

 that the curvatures and convolutions of their laminae and 

 beds, their occasionally brecciated and conglomerated struc- 

 ture, their elongated masses in the form of rock-veins, and, 

 lastly, their mineral and metalliferous veins, do furnish phy- 

 sical evidence of mechanical movements ; for such appear- 

 ances, in most instances, if not in all, may have originated 

 from peculiar modes of arrangement during the aggregation 

 of the constituent particles of the primary rocks. 



B B 



