254 Proceedings of the Royal Society 
down towards the west, it is probable that the striating agent bad 
come from the west. 
On this smoothed and striated rock, there were large boulders of 
grey granite ; I measured two, of the following dimensions, viz. , 
15x12x5 feet and 13x5x5 feet. Their longer axis was the 
same, viz., W.S.W. It is proper to remark, that the sea-lochs in 
this part of the coast occupy troughs which lie in a direction W.S.W. 
and E.N.E., and that the ridges of land which separate these lochs 
run in a similar direction. 
The boulders and striated rock just mentioned are on the S.E. 
side of the ridge which divides Loch Sweyn from Loch Killesport. 
But on crossing the ridge north towards Loch Sweyn, I found most 
of the boulders on the hill slopes which face the N.W. all lying in 
the same manner, viz., with their longer axis parallel to the loch and 
to the ridge of high ground. On this slope, the boulders are in 
thousands. I measured a few of the largest, — one was 15 feet square 
and 8 feet high, another 18x7 x 5 feet. The ridge between the 
two lochs rises gradually to the eastward inland to a height of from 
500 to 700 feet. 
In this district I saw no detritus. If there ever had been detritus 
it had been swept off, as the rocks in situ were everywhere visible, 
and the boulders were lying mostly on the bare rock. Of moraines I 
saw no appearance. Sitting on this hill slope, and pondering from 
what quarter these boulders in such numbers could have come, it 
appeared to me that, in order to reach and remain on this hill slope, 
they could have come only from the N.W. If the agent which 
brought them, had come down the loch from the N.E. there was 
nothing to cause them to stop and remain where they now are ; — 
they would have gone on towards the open sea at the lower end of 
the loch. If they had come from the S.W. there was nothing to 
obstruct their further progress up the loch. 
In walking further up the loch, Mr Alexander and I passed a rock 
surface, pretty steep, and sloping down southwards, on which there 
were many deep striae running ‘W.S.W. and E.N.E., parallel with the 
general axis of the valley. The striating agent seemed to have come 
up the loch. This was at a place named on the Ordnance Map “ Doide .” 
Here we obtained a boat and crossed over to D:mna Island , to examine 
a large boulder which gives its name to the farm “ Danna na Cloiche .” 
