582 Proceedings of the Royal Society 
valley, probably did not move the boulder, and so would leave it in 
its original position or nearly so. 
I proceeded next towards Loch Glashan , and was rather surprised 
to see the hills on its south side, which sloped down towards the 
JST.E., well-covered with boulders, and also striated rocks, facing 
N.E. and X.N.E. In fig. 5, plate XVII., there is a view of one of 
those boulders, 8x4x3 feet, on Knock farm, resting on a 
smoothed rock, dipping H.H.E., at an angle of about 30°, and 
at a height of about 400 feet above the sea. At this place, 
looking towards the H.H.E., there seemed to be a sort of low 
level district for some miles, with high hills on each side. On 
examining the map, I found that Loch Awe and Loch Etive were 
in that direction. 
5. A few weeks after being at Loch Gair, I visited Loch Awe, and 
remained for a few days at Port Sonnachan , situated on the south 
bank of the lake. 
On inquiring of the innkeeper, I was informed of a remarkable 
boulder situated among the hills to the south, and distant 3 or 4 
miles. Having obtained the services of a shepherd as guide, I pro- 
ceeded on foot across the moors, and came to a high corry, with a 
ridge in the middle, on which ridge the boulder stands at a height 
of 1026 feet above the sea. The boulder is so distinguishable from 
every other in the district, that the corry takes its name from it, viz., 
Corry na clack. 
Fig. 7, plate XVII., gives a distant view of the boulder among the 
hills to the south of Loch Awe. Eig. 8 shows its position on the 
ridge where it stands. This ridge is narrow and has steep sides, so 
steep that they can be climbed with difficulty. The side facing the 
south is about 80 feet, the side facing the north is about 50 feet, in 
height, above the level ground adjoining. 
The ridge, shown in figs. 7 and 8, is composed entirely of a soft 
arenaceous mica schist, in thin slaty strata, which stand up verti- 
cally, and form a table about 3 feet above the ridge, as shown in 
fig. 9. This table, on which the boulder sits, is about 5 feet square. 
The surface of the table slopes down to W. by S. at an angle of 22°. 
The boulder on this table of rock occupies a most precarious posi- 
tion. Stooping below the boulder, to examine the strata forming 
the table, I saw daylight across, under the boulder, and observed 
