1921 GEOGNOSTICAL SKETCH OF THE 
.and/low ridge, which I shall afterwards shew to be com- 
posed of transition-rocks, they fall into the low grounds 
between Fort George and Nairn. 
Such are the ranges of hills seen from Inverness, and 
which are connected with that portion of the Great Glen 
we are about to describe. 
By extending the sphere of vision, we might have in- 
cluded the ranges of Ben Nevis and Strath Connon in 
Iloss-shire, and those of Strath Glass and Strath Nairn in 
Inverness-shire, but these have no connection with the 
mountains of the Great Glen. 
According, then, to the above statement, we shall have 
to describe, in the circuit seen from Inverness, four distinct 
ranges of mountains. The first of these extends from the 
entrance to the Frith of Cromarty to Dochfour. The 
second, from Dochfour, or rather from a point (called 
Phopachy, to be afterwards noticed) behind it, to Fort 
Augustus ; the third, from Fort Augustus to Dores ; and 
the fourth, from Dores, by the Muir of Culloden, to Fort 
George. 
After describing each of these in the above order, we 
shall conclude with a brief examination of the alluvial mat-^ 
ters contained in the intervening valley. 
FiKST IlAiJGE. — From Cromarty to Dochfour, 
It may be observed at once of this range, that it is part 
of the great deposit of Red Sandstone, which has been so 
frequently described as skirting the whole of the east coast 
of Scotland, north of the Spfey. Whether this red sand- 
stone is to be considered of the same nature with that de- 
scribed as occupying so large a portion of the west coast, 
I am not able to determine, having never seen any of the 
