ON THE VICINITY OF LOCH-LOMOND. 403 



that if a layer of only a few lines thickness could 

 be formed by the agents now supposed acting in 

 directions different from, or opposite to, that of 

 gravity, and thus modifying the effects of that 

 power, — layers or strata, of any magnitude ob- 

 servable in nature, might have been formed in the 

 same way. And unless this hypothesis be admit- 

 ted, the appearances which have been described, 

 must remain for ever inexplicable. 



On the whole, the phenomena exhibited in the 

 actual position, and internal structure, of the mica- 

 slate of Ben-Lomond, may be quoted as an au- 

 thentic and demonstrative record, attesting the 

 teality of operations and events that have taken 

 place at some former period in nature, by powers 

 or causes, of which the action has not hitherto 

 been recognized in our geological speculations. 



