914 
Proceedings of the Royal Society 
Societies, he caused a map (on the 6-inch scale) to he executed of 
the particular districts in the Spean valley, to which I am about to 
refer. 
This district is in that part of the valley where the Eiver Spean, 
flowing from Loch Laggan, is joined by a smaller stream from Loch 
Treigp 
The Outline Map A (Plate XI,) gives a general idea of the position 
of the gravel banks, v/ith reference to Loch Treig and the adjoining 
Bivers Spean and Treig, The dark dotted line indicates shelf lY., 
being the lowest beach of the lake v/hich stood at a height of 
about 855 feet above the seadevei. The dark shaded line, sur- 
rounding the valley, shows generally the position of the adjoining 
hills, at a level above the sea of from 1300 to 1500 feet. 
I had my attention first drawn to these banks and boulders when 
walking along the line of shelf lY, near the mouth of Loch Treig. 
On looking up at the hill slope situated to the south of this 
loch, I noticed several projecting lines of terraces, at much higher 
levels than shelf lY., and at first thought that they might repre- 
sent some of the shelves of the higher lakes, which had been 
recognised in other Lochaber glens, but not in this one. 
I thereupon ascended the hill, and, on doing so, obtained a general 
view of the low grounds, and of the remarkable assemblage there of 
kaims and boulders. I at opce saw that many of both formed 
lines, in some cases rectilinBal^ but also and even more frequently 
curvilineal^ the inner curves facing the north, ie., down Glen 
Spean, (See A on Sketch Map, Plate XL) 
The first terrace on the hill slope which I reached was (by 
aneroid) at a height of 1120 feet above sea-level, The terrace pre- 
sented a level surface from 40 to 5,0 feet wide, abutting against the 
hill, and was composed of water-borne gravel. Two great boulders 
lay on this terrace, about 200 yards apart. 
From this terrace I climbed to another, at a height of 1165 feet 
above seadevei ; on it were three large boulders. 
There was still another terrace, and its height above the sea I 
found to be 1175 feet. 
Again a higher terrace was reached, 1480 feet above the sea, 
somewhat broader than the others, and having a considerable 
number of boulders on it, 
