32 ON THE PARALLEL ROADS 



ret, situated at the upper part of this plane, near the junction 

 of the two streams combining to form that river, whence it 

 stretches under the mountain of Tom-Bhran, and crosses to 

 the south side of Glen Roy, narrowing as it begins to return 

 downwards, till it gradually again assumes the ordinary ap- 

 pearance of a proper shelf. I shall here content myself with 

 mentioning, that Shelf \th is to be traced all the way down 

 the S. E. side of Glen Roy ; but I shall postpone the descrip- 

 tion of its progress around Glen Spean, until I shall come to 

 notice that valley in particular. 



By looking at Plate II. Shelf 3d will be observed beginning 

 on the north side of the mouth of Glen Roy, at a hollow on 

 the S. E. side of the round hill of Bohuntine, whence it disap- 

 pears into the glen. As Shelf 2d does not show itself until a 

 little way farther on, its origin is not visible in this sketch ; 

 but a reference to the map will show the commencement of 

 both these shelves, which sweep around the eastern, or Glen 

 Roy side of the hill of Bohuntine, and then bend into the Gap 

 which leads into Glen Collarig, where they show themselves 

 as represented in the sketch, Plate III. fig. 2., and where they 

 appear to terminate suddenly. The same drawing will also 

 show, that they commence as abruptly on the north side, at 

 points exactly opposite to those where they are broken off on 

 the south side. From thence they run back towards Glen 

 Roy, on the same level, sweep north-eastwards into that glen, 

 and continue very distinctly marked throughout all their bend- 

 ings, in their progress upwards. Indeed there is nowhere a 

 more favourable view of the shelves of Glen Roy, than is en- 

 joyed from this Gap, (see Plate IV. which was sketched from 

 this point). Proceeding to trace shelf 3d and shelf 2d, up the 

 north-west side of Glen Roy, they are found to turn north- 

 wards into Glen Turret, and to run around all the sinuosities 



of 



