288 



ON THE HIGHLANDS. 



calcareous matter and pyrites decomposing, form 

 specks of reddish-brown. 



It is remarkable, that mica-slate, of nearly the 

 same external characters with the indestructible 

 species just described, is found on the north-east 

 side of Ben-Ledi, in a line of direction correspond- 

 ing to the usual bearing of the strata ; from which 

 it is probable, that the same rock runs for a dis- 

 tance of many miles, through Glenfinlas, and the 

 central parts of Ben-Ledi, forming in its course, 

 a variety of serrated and lofty peaks, particularly, 

 I suppose, the inaccessible heights of Benian and 

 its attendants, which to the north-east, crown the 

 striking and picturesque beauties of the Tro- 

 sachs. 



Having finished the account of what I ob- 

 served in this part of my excursion, I shall now 

 mention a few geological inferences, which ap- 

 pear to follow from the principal facts that have 

 been stated. 



I. It may reckoned extraordinary, in what way 

 the beds of conglomerate, first described, have 

 assumed their present upright position. The uni- 

 formity, however, of their general direction and 

 inclination, in following the regular course of the 



