246 
Proceedings of the Royal Society 
Monday , IWi Jidy 1881. 
Sir ALEXANDER GRANT, Bart., Vice-President, 
in the Chair. 
The following Communications were read : — 
1. Report of the Boulder Committee, with Remarks by the 
Convener, Mr D. Milne Home. (Plates I., II., III.) 
NOTES BY CONVENER. 
Argyleshire — Crinan Canal. 
1. Between Crinan Bay on the north and the head of Loch Eyne 
on the south, there is a trough or hollow now occupied by the Crinan 
Canal. The highest point along this trough, is about 150 feet above 
the sea. A series of locks occur at this summit-level, to allow of 
the passage of vessels between the two sea-lochs. 
At the summit-level, the rocks form a sort of ridge across the 
valley, with smooth surfaces towards the north, and rough surfaces 
towards the south. 
On both sides of this rocky ridge, there are large boulders ; on 
the north side, I counted between forty and fifty, on the south 
side, there are not more than two or three. The boulders are a 
syenitic gneiss ; the rocks in situ , are shivery clay slate, nearly 
vertical, dipping steeply towards the south. 
Three or four of the boulders on the north side, I found pressed 
or squeezed up against the rocks in situ , in such a way as to show 
that they had come from the north, and had been obstructed 
in their farther progress southwards by the rocky ridge. In 
one case, the boulder lies with its longer axis N.N.W., which 
is about the direction of the valley at this place. There is a hollow 
on the north side of the ridge, as if made by the force with which 
the boulder had been pushed or driven against it. Other two 
boulders were in size 10x5x4 feet, with the longer axis W.N.W., 
and 9x5x4 feet, with longer axis and sharpest end due north. 
