167 
of Edinburgh, Session 1878 - 79 . 
3. Fig. 43 represents a boulder on another hill near Gairloch, 747 
feet above the sea, on the edge of a high cliff facing the west, and 
partially resting on two small boulders at its east end. It is a coarse- . 
grained granite, whilst the rock of the hill is a schistose gneiss. It 
projects 2J feet beyond the edge, and it in like manner could not 
possibly have obtained its position except by being brought from 
the west. 
4. Fig. 44 represents a hill about one mile N.E. from Gairloch 
Hotel, at the top of which (585 feet above the sea) two boulders 
attract notice. The largest is a block of close-grained Silurian rock, 
blue in colour and very hard. The smaller is a small block of reddish- 
brown sandstone, with minute pebbles in it of quartz and felspar. 
The rock of the hill here is a bluish clay slate, the strata of 
which are almost vertical. 
Fig. 45 is a representation of the largest of these boulders taken 
from its N.E. side at a distance of about 10 yards. The Convener, 
on a minute examination, found that the boulder was resting on the 
rock of the hill, at three points, and that at the lower end it projected 
2 feet beyond one of the points of attachment. The boulder 
sloped down towards the N.W. at an angle of 15°. The points of 
attachment to the rock seemed so slight that the Convener thought 
he would have little difficulty with a crowbar in precipitating the 
boulder down the precipice. 
The red sandstone boulder is about 10 yards distant from the 
large boulder, and lay on a rocky surface facing the W.N.W. 
5. Near the foot of the hill just referred to, there is a rocky knoll 
on the top of which a number of true erratics are clustered. The 
uppermost is 6 x 5 x 3 feet in size, and lies in such a position over 
the others as to show that it had most probably come from the N.W. 
This cluster is shown on fig. 46. 
6. There was only one place where striae on a smoothed rock surface 
were observed. It was about half a mile to the N.E. of Gairloch 
Hotel, its height above the sea 340 feet. Fig. 47 represents this rock 
surface. It slopes about due west at an angle of 30°, till it comes to a 
nearly vertical cliff. The boulder is 10 feet high, 6 feet wide, and 
about 4 feet thick. It is within 2 or 3 feet of the edge of the pre- 
cipice, which is about 50 to 60 feet high. On one side of the boulder, 
several striae are visible, running E. by N. They had apparently com- 
