MINERALOGY OF THE OCHILS. 



volcanic agency, by those whose zeal for hypo- 

 thesis outstrips their love of accuracy. 



Only the lower portions of this rock contain 

 crystals of hornblende, which give way at the 

 higher points to those of calcareous spar. 



XIT. Compact Felspar. 



Very beautiful brick-red and flesh-red compact 

 felspar, possessing all the usual characters, forms 

 the caps of some of the smaller hills of the south- 

 ern chain of the Ochils, which extends from the 

 neighbourhood of Dollar, to the banks of the 

 Eden. Near Cupar, it occurs so abundantly, as 

 to be the sole material for repairing the roads. It 

 appears to be the newest member of the series, 

 and to correspond both in its individual characters, 

 and in its geognostic relations with the felspar of 

 the Pentland Hills, where it was first noticed for- 

 ming distinct masses by Professor Jameson. At 

 the summit of Lucklaw, this felspar passes into 

 hornstone. A solitary bed of it is to be found in 

 the alternating series of sandstone, clay stone, and 

 tuff, in Wormit Bay. 



Veins. 



Having thus briefly noticed the prevailing rocks, 

 I shall now mention the veins traversing these 



