274 
Proceedings of the Royal Society 
throughout the whole sweep of Choir egrogain from its extreme 
altitude of 1700 feet down to the level of Loch Long. 
The manner in which this little Choire Sugacli is shut in from 
the west — first , by the spur which connects Ben Narnan with Crois ; 
and secondly , by the towering bulk of line to the back of this ; and 
thirdly , the palpable shedding of its ice to the eastward, out of 
a hollow surrounded with craggy and rough-edged rocks, and in a 
district which nowhere else shows glacial action, is unfavourable to 
the supposition that the ice which had been grinding the rocks had 
come either from any floating sheet from the west, or from any 
enveloping mantle from the east. The parts here seem to show 
that though elsewhere there may be examples of either or both of 
these agencies, there is evidence that the temperature of the country 
was at one period such that glaciers, however small, were generated 
and cradled among its hills. 
From Arrochar Professor Heddle walked across the range of hills 
towards Loch Goilhead ; one day was spent in visiting Loch 
Restil and Ben Lochan (2955 feet). On the following day 
he went up Corry Corran; then, over the shoulders of Beinn 
Lochain (2304 feet) ; then, into the trough of Corry Locliain ; 
over the ridge and top of Beinn Blieida (2557 feet ) ; over 
the north shoulder of Cnoc na Trieriche , down to Lochan nan 
Cnaimli , over Crauch nan Miseag (1989 feet) and back to Loch 
Goilhead by the shore. No boulders, moraines, or traces of glacia- 
tion were seen during these two days. 
Professor Heddle, on a review of the whole of the foregoing 
explorations, states that the South-Western Highlands appeared to 
be singularly barren of boulders at high elevations, and that the 
only traces of ice afforded evidence of glaciers of small size, formed 
in some of the valleys and hollows among the higher hills. 
He thereafter decided to return to the more northern district of 
the Highlands, where in the previous summer he had met with 
boulders of large size, not only perched upon ridges, but forming 
streams, stretching for miles continuously. 
As one of these streams had been found on the Moor of Kannoch, 
and extended eastward to and beyond Loch Tulla, he went to 
Fortingall, that he might from that point follow the chain of hills 
which block more or less the moor at its eastern end. 
