160 Proceedings of the Royal Society 
the district, mentioned that the trainee of "boulders could he 
followed for some distance over the hill, towards Glen Etive and 
Glencoe. 
A very large boulder exists in a cul de sac formed by lofty hills 
near Carphin at the head of the valley. It goes by the name of the 
Ardshiel boulder, in consequence of having been made use of by the 
proprietor of Ardshiel for concealment in the time of the Rebellion. 
This boulder is 40 x 27 x 15 feet = about 1000 tons. 
A fissure exists through the middle of it, which is large enough to 
allow of a man getting into it from the top, where, however, the 
fissure is not discoverable at any distance in consequence of beech- 
wood growing on it. This boulder is, in composition of rock, the 
same as all the rest of the boulders in the glen, and it has un- 
doubtedly been floated like the rest, up the glen. It is blocked on 
its west side by a large mass of rock, which stopped its further 
progress up the glen. Its height above the sea is 506 feet. On 
account of its weight, the ice which rafted it was probably so deep 
in the water that it could not get over the summit level by which 
smaller boulders passed to the east of Carroban hill. 
The boulders in Glen Creran are mostly on coarse gravel. At one 
place above Salar House, there is a cluster of boulders on a rocky 
knoll. 
The summit level on the east side of Carroban hill is about 800 
feet above the sea. If the sea, when these boulders were being 
transported, stood, say 2000 feet higher than at present, any current 
from the N.W. would flow through and over that Carroban pass. 
On that supposition, it would not be difficult to account for the 
trainee of boulders in Glen Creran and for the presence of the 
gigantic boulder in the cul de sac at Carphin. 
If Robert Halls statement that the black granite boulders are 
traceable up the Carroban valley, and over the summit level which 
separates Glen Creran from Glen Etive, some of these boulders 
should be found in the upper parts of Glen Etive. As the Con- 
vener passed up that valley on the coach which travels between 
Loch Etive and Glencoe, he observed several boulders on the moors, 
near the road, exceedingly like the Loch Creran boulders ; but he 
had no opportunity of particularly examining them. 
With the view of so far testing the statement by Hall, the Con- 
