70 
THE PARALLEL ROADS OF 
great masses of ice in the valley of Strath¬ 
more, thus combining with the eastern ice¬ 
field, just as the glacier from Mont Blanc 
and the vallev of the Rhone formerly combined 
in the western part of Switzerland with those 
of the Bernese Oberland. The relations are 
identical, though the geographical position is 
reversed, — the higher range, or the Grampian 
Hills, lying to the north in Scotland, and the 
lower one, or the Sidlaw Hills, to the south, 
while in Switzerland, on the contrary, the 
higher range lies to the south and the lower 
to the north. I have alluded especially to 
Glen Prossen because the glacial marks in 
that valley are remarkably distinct, the whole 
bed of the valley being scratched, polished, 
and furrowed by the great rasp which has 
moved over it, while the concentric moraines 
at its lower extremity are very striking. But 
these signs, so perfectly preserved in Glen 
Prossen, recur with greater or less intensity 
in all the corresponding valleys, leaving no 
doubt that the same phenomena existed over 
the whole region. 
Among the localities of Scotland where the 
indications of glacial action are most marked 
