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Proceedings of the Eoyal Society 
towards W. by 1ST., instead of iST.N. W. This last mentioned boulder 
was lying not on drift, as the others were, but on bare rock. 
A little further east, where the high road passes through the lands 
of Castle Sweyn, but above the road, and at a level of about 200 
feet above the sea, found a group or cluster of boulders, four or five 
in number, touching and partly covering one another, as shown in 
diagram 8. The remarkable feature of the spot is, that the slope of 
the hill here is so steep — about 40° — that it was hardly conceivable 
how the blocks should, when laid down on such a slope, have 
remained on it, and have for ages retained their position. The only 
probable explanation seemed to be, that beneath the two lowest 
boulders there were portions of projecting rock which supported the 
whole group. The slope of the hill here is down towards W.N. W. A 
study of the whole position led to the conclusion that these boulders, 
to obtain their lodgment, must have been brought from W. by N. 
Still farther east the road passes over an extensive plateau or 
table-land of drift, which has a general height of 120 feet above the 
sea. The farm of Doidhe is here. A gravel pit (almost 8 feet deep) 
for the excavation of road metal was examined. The layers of gravel 
and sand in it were found to be horizontal. 
All along the road towards Aslifield, Deltot, and Achnamara, 
large boulders occur on both sides, though not in nearly such 
numbers, as near the open sea at Kilmory, and near Castle Sweyn. 
‘lOth July, Ardrishaig. — Was guided by Mr Alexander to the 
farm of Aeh-na-Brack {Field of Spots) to see some remarkable 
sculptured cup-markings on smoothed rocks. 
These rocks occupy an extensive portion of pasture ground. They 
are of hard gneiss, and the smoothed surfaces slope down towards 
about S.W. at an angle of 10° or 12°. They have evidently been 
smoothed by natural agency. Strise occur on them at several 
places. The direction of the strise varies a little, being in some 
spots from W. by N., in others from N.W. One small boulder was 
seen, on the west side of one of the smoothed ridges of rock, 
and seemed to have been stopped by the rock in its progress 
eastward. 
The cup-markings are very numerous, and consist as usual of 
circular ruts as shown in fig. 9. They are of different sizes ; the 
largest about 2 feet across. The straight rut issuing from the 
