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Proceedings of the Royal Society 
tinguishable from the conglomerate of Wemyss Bay, situated about 
30 miles to the north. 
Argyleshire. 
Colonsay . — The rocks near the place in this island where the steam- 
boat calls, viz., on the N.E. side, were found to have been smoothed 
in a line bearing W.N.W. and E.S,E. ; but from which direction 
the smoothing agents had come was not ascertained. 
North Uist . — At Loch Maddy the rocks were found to have been 
smoothed every where, and in the same line as at Colonsay. 
There are localities which show unmistakably that the smoothing 
agent had followed a course from west to east, or rather from the 
north of west. But the hollows or trenches between the higher 
grounds and the strike of the old gneiss strata have exercised some 
influence in diverting the smoothing agent, sometimes one way and 
sometimes another. 
The two trap islets, Maddy More and Maddy Beg, porpoise-nosed 
to the west, and cliffy to the east, vouch for the direction of flow of 
the agent which conferred upon them their striking forms. 
Whilst at Loch Maddy, I was accompanied by Mr Harvey Brown, 
who has written several well-known works on the natural history of 
Scotland, and has noted glaciation with an active eye, and an intel- 
ligent and independent mind. 
Mr Brown had lately returned from a visit of some duration to 
Newton, on the coast of North Uist, where he had Mr James 
Thomson of Glasgow as a companion. He furnished me with a 
sketch and description of a boulder which lies on sloping ground to 
the S.E. of Newton. It is 13x5x4 feet. It lies with its longer 
axis pointing N.N.W. and S.S.E. Another is 9x5x5 feet. He 
stated that Mr Thomson and he had spent some time in examining 
the glaciation of the neighbouring shore, and found that all the rocks 
were glaciated from the N.W. He suggested my applying to Mr 
Thomson for farther information. Mr Thomson, in reply, stated 
that the glaciation on the west shore of the Long Island was all from 
the west, varying occasionally between N.W. and S.W., and he 
added an expression of surprise that any one could have made the 
mistake of not seeing this fact, it was so palpably evident. 
Harris . — On Gilebhal Glass, the southern flanks are striated up 
