of Edinhurgh, Session 1883-84. 
805 
He found that the rock surface described by Mr Stevenson is 
situated on the H.W. side of the Law, and that the smoothed part 
slopes down towards the and H.W., at an angle of from 65° to 
70°. 
Parts of the smoothed surface face H.W., other parts face due 
north, and some H. by E.; but wherever the rock faced a more 
easterly direction, there was no smoothing. 
The only parts of the smoothed rock surface striated were those 
fronting H.W. by N., or a few degrees on either side of that point. 
Their direction is W. by S., or W.S.W.j and most of them are 
apparently horizontal. 
Some of the ruts and striae, especially at their west ends, are 
deeply incised in the rock, showing the extreme and continuous 
pressure which predominated there. 
The particular direction in which the striating agent moved, may 
be inferred, by considering, that if it came in a direction 'parallel 
SOUTH 
North Berwick Law. 
with the rock surface, it might grind or smooth, but would hardly 
produce ruts or striae; nor would it have this effect, if it came 
against the rock surface at right angles. A line parallel with the 
rock surface, would be S.W., and a line at right angles would be 
about H.N.W. The intermediate point would be W.N.W. ; — from 
which direction therefore, (the Convener inferred) the striating 
agent moved on and against North Lerwick Law. 
