of Edinburgh, Session 1880-81, 
249 
Over these rocks lies a bed of boulder clay containing granite boulders. 
One which I found undisturbed, measured 5x3x3 feet, with its 
longer axis pointing N. by E. and S. by W. 
On walking over the hills E E (Plate I.), situated above Professor 
Blackie’s cottage, I fell in with a valley about three-quarters of a 
mile long, opening towards the north. The bottom of the valley 
is about 80 feet above the sea, with hills on each side reaching to 
about 300 feet, and blocked at its south end by a range of hills 
about 600 feet above the sea. In this valley, I found two or three 
granite boulders, from 3 to 4 feet in diameter, on the east side of 
the valley, at a height of about 120 feet above the sea, lying on 
slate rocks. These granite boulders could not have come into this 
valley except from the north. The width of the valley is from 
300 to 400 yards. Erom the peculiar position of the boulders on 
the east side of the valley, it may be very probably inferred, that 
they had come from some north-westerly point. 
The sides of the valley where these boulders lie, are at present 
exceedingly steep, and it seemed marvellous that if they fell on the 
surface where they now lie, they did not roll to the bottom. It 
occurred to me that probably when these boulders arrived, the 
valley was filled with gravel, and that as the gravel was scoured out 
by streams, the boulders slowly subsided to their present positions. 
On the west side of the valley, there is another grey granite 
boulder, at a level about 30 feet higher than the site of those just 
mentioned. It is 4 x 3 x 3 feet, and with its longer axis pointing 
M.E. 
At the north end of Oban Bay, the grey granite boulder is situ- 
ated, which was mentioned in last year’s Beport (p. 11). Its 
position is indicated on Plate I. by the green-coloured dot near 
the letter A. Its position close to the high conglomerate cliff raises a 
presumption that it had come from the westward, and had been inter- 
cepted in its farther progress by the cliff. This is strengthened by 
the fact mentioned in last year’s Beport, that its longer diameter 
points W. by N. It probably came by the same agency, whatever 
that was, which brought the other grey granite boulders shown in 
Plate I. 
I examined the small island in Oban Bay opposite to Professor 
Blackie’s cottage, near the east side of Kerrera Island (Lin Plate I.). 
