^4 ON THE PARALLEL EOADS 



ed from the larger, a peat-moss has been formed, though the 

 comparatively triflhig surface exhibited by the whole of the 

 elevated and rather rounded top of this isolated hill, is cer- 

 tainly a situation where such a deposit is hardly to be looked 



for. 



The numerous torrents that pour down the sides of the 

 mountains of Loch Treig, have very much defaced the course 

 of Shelf 4th around that lake. Although very distinctly seen 

 at its northern end, it is but faintly traced along its eastern 

 side. It is to be observed at the southern extremity, and ap- 

 pears very visible on the western side, where it leads back and 

 winds again into Glen Spean. 



After leaving the mouth of Loch Treig, Shelf 4th is easily 

 traced along the hills on the southern side of Glen Spean. It 

 appears particularly well marked on the even faces of the 

 mountains, for a long way before it comes to what may be 

 called the Mouth of the glen ; and just above the House of 

 Inch, it sweeps away in company with the receding moun- 

 tains, where, though faint, it is easily followed, to a ravine 

 called Corr-a-cloicfilich, whence I thought I could even trace 

 it, though with some little difficulty, through an opening in a 

 thin birch wood, on the side of Aonach-more, nearly as far as 

 the projection of that mountain, where all appearances of it 

 are finally lost. The projection to which I allude here, is the 

 same which, as I formerly remarked, is met by a semicircular 

 ranwe of little eminences, forming a kind of elevated moor, 

 sweeping towards it from Highbridge, and enclosing what I 

 have called the Basin, in the open country of the Spean. This 

 moor rises nearly to the level of Shelf 4th, and some of its 

 more elevated points seem even to rise above it. These last 

 observations will be found to be extremely important in the 

 theory which it is now my intention to propose. 



PARTICULAR 



