D. MILNE HOME ON THE PARALLEL ROADS OF LOCHABER. 635 
Therefore, if these banks are the moraines of a glacier from Loch Treig, 
that glacier could not have existed contemporaneously with the lake of Shelf 4. 
The lake must have been formed after these so-called moraines were formed, and 
after the glacier which produced them ceased to exist. 
The idea that these banks were moraines was suggested, probably, by their 
curved forms. When glaciers protrude from a valley, they often carry rubbish 
and boulders on their surface, which, on reaching the lowest end of the glacier, 
are projected over its surface as the glacier melts ; and should the glacier at 
some future period push forward again, they are, by the pressure of the glacier, 
formed into a bank, which has somewhat of a crescent or horse-shoe form, the 
concave side being, of course, towards the glacier. 
In examining the Ordnance Map, it will be seen that there are some 
very remarkable curved lines dotted over with boulders, but that only a few 
of the curves face Loch Treig. 
If any inference is to be drawn from the aspects of the lines, they point 
rather to some agency which has come up Glen Spean Valley. Now, 
there is strong evidence to show that an agent of some kind did come 
up this valley, and on its way up acted with tremendous power. The hard 
rocks on both sides of the valley, where the valley is narrowest—viz., near 
the Roman Catholic Chapel and at Murlaggan—have been ground down, . 
smoothed, and polished. These are well seen, at five or six places between 
the chapel and the junction of the high roads to Laggan and Loch Treig. 
Most of the surfaces of rock so polished, slope down, and, as it were, face 
down the valley, and the striz upon them run W.N.W. and E.S.E.—hbeing a 
direction parallel with Glean Spean valley. There are very few smooth surfaces 
of rock which face or look up the valley, and these few are not striated. 
Near Achleureuch Post-Office a clay slate rock, sloping down the valley, 
presents very large smoothed surfaces. It so happens that the rock there 
contains many nodules of white quartz, which stand up above the softer rock, 
having better withstood the grinding. These quartz nodules have been beauti- 
fully polished on their sides or surfaces which face down the valley, indicating 
clearly that some body or bodies passed up the valley, pressing severely its 
sides, and grinding, smoothing, and striating the rocks. 
. Other localities may be mentioned in Glen Spean. Thus, near Inverlair 
Bridge there are several rocks with striz on them, running N.N.W. At the 
junction of the Inverlair and Loch Laggan roads, there is a rock showing 
strie W.N.W. 
These directions are quite at variance with the notion of an outflow from 
Loch Treig, and indicate a movement through, parallel with, and up Glen 
Spean valley. 
As the facts now referred to are important in their bearings on this 
