258 
Proceedings of the Royal Society 
that if the rocks of Stirling Castle, Craigforth, and other places 
were examined, interesting and instructive traces of similar glacial 
action might be discovered. 
To this suggestion of an inquiry for cases of a similar kind, I am 
now here to respond, and with that view to lay before the Society 
an account of several striated rocks in East Lothian, Stirlingshire, 
and other places: I feel sure that Mr Stevenson himself will deem 
these cases not the less interesting, though they should warrant 
conclusions different from those he suggested. 
I. East Lothian Striated Kocks. 
The first of these which I mention, as the least complicated, are 
in the village of Linton. 
The rock is a claystone porphyry. Several smoothed patches of 
rock occur here, and two of these show striations on surfaces from 
3 to 4 square feet in extent. 
One of these smoothed rocks is horizontal or nearly so ; and on 
it the striae have a direction W..N.W. and E.S.E. 
The other smoothed rock dips towards the north, at an angle of 
about 35°, and on it, the striae run due east and west. 
The difference between the directions of the striae of these two 
rocks, which are only a few yards apart from one another, may be 
accounted for by the fact that the same agent which produced striae 
in a certain direction on a horizontal surface, would, if that agent 
could ~be easily defected , not produce striae in the same direction on 
a sloping surface. It would have less power to move up an inclined 
plane, but would move along it more horizontally. 
What the striating agent was here, and in what direction it 
moved, is made manifest by the following facts. Both patches 
of rock were, when I examined them, still partially covered by a 
coarse clay, full of stones or pebbles, many of which were hard and 
angular, but some were soft. There were among them bits of coal 
and limestone, which must have come from the westward, as 
in East Lothian there are no coal or limestone strata to the east of 
Linton. In one of the smoothed patches there were two small 
hollows or depressions, which had interrupted the continuity of 
some of the striae. These depressions on their inner surface showed 
a vertical wall on their west side, and a sloping wall on their east 
