Dr. Mac Culloch on the Parallel Roads of Glen Roy. 339 



Spean, as must have already been remarked, like that of Glen Roy, 

 has the same direct and present communication by means of the 

 Lochy with the western sea. 



The opening of Glen Gloy is narrow, but its communication at 

 Lowbridge with the long valley now described, is at a point some- 

 what higher in elevation than that at which Glen Spean enters, since 

 its water falls into Loch Lochy, the source of the river of the same 

 name. 



Tracing therefore the course of this valley, into which Glen Roy 

 and Glen Gloy open, we find it communicating with both seas. Its 

 highest level is at Loch Oich, the point from whence the waters 

 decline in two directions, and this elevation is ninety feet above that 

 of the sea at Loch Eil. Besides the waters issuing from Glen Roy and 

 Glen Gloy, it receives at various points to the south-westward of its 

 summit level, the streams which issue from Loch Eil, Loch Arkeig, 

 and numerous smaller glens, while on the north-eastern slope it is 

 the receptacle of the waters of Loch Garry, Glen Morrison, Fyers, 

 Glen Urquhart, and others of less note. Hence it appears that 

 its upper level is inferior by 886 feet to the lowest line of Glen 

 Roy, and by 1180 feet to the uppermost, the height of the upper 

 line of Glen Roy being found from barometrical measurement to be 

 1 262 feet above the level of the western sea. Examining now the 

 glens which communicate laterally with this great valley, we shall 

 find that they are all situated on the western side. They are Glen 

 Morrison, Glen Urquhart, Glen Garry, the glen of Loch Arkeig, 

 and that of Loch Eil. 



From want of time for so laborious an undertaking, I am unable 

 to describe either the disposition or the elevations of the four first of 

 these branches, but have reason to think that they all rise at their 

 western ends to levels higher than those of the lines in Glen Roy. 



