28 Dr. T. Archibald Dukes on 
the same way the upper parallel “road,” height about 1150 ft., 
corresponds to the level of a “col” at the top or far end of the 
Glen Roy Valley, height 1151 ft.) Again, note that the upper 
parallel ‘‘road’’ terminates above (i.e. north of) the Glen Glas 
Dhoire entrance. The second “road,” after running up towards 
the “col,” is continued beyond on to the side of the big hill— 
Creag Dhubh—and ends there; while the lowest ‘road’ runs 
right away round the Creag Dhubh Hill into the main Spean 
Valley, of which this Glen Roy is a mere tributary. 
i SO 
Fic. 5.—A reduced Ordnance Survey: map of the district. Mountains 
shaded according to elevation, but heights over 3000 ft. are lighter, as though 
snow-capped. Ben Nevis and his range are seen running east from the top 
of Loch Linnhe. The Spean Valley, near the centre of the map, runs 
parallel and to the north of this range. Glen Roy is a branch valley on the 
north side of the Spean. 
In this Glen Spean no traces of the upper two parallel ‘‘roads”’ 
are anywhere found, but the lowest ‘‘road’’ is, at intervals, re- 
peatedly indicated, either by faint lines or big terraces on its 
boundary mountains, and always at this level of 850 ft.; so that, 
as we travel along the coach-road up this valley, we gradually 
mount up towards the same level, and several times before we 
reach Loch Laggan find ourselves actually on a broad terrace at 
this same level. Here, looking across the valley towards where 
the river Gulbin joins the Spean, we see what looks for all the 
