262 
Proceedings of the Royal Society 
The ground in the gorge rises pretty steeply from the north, viz., 
about 100 feet to its summit-level at B. 
On four or five masses of rock on the west side of the gorge, and 
at about its narrowest part, there are some remarkable striae on 
the smoothed rock surfaces. Mr Millar measured several of the 
longest, and found them to be 12 or 13 feet in length. They 
almost all sloped up towards the south, and were several feet above 
the bottom of the gorge. The angles of slope were measured by a 
clinometer. The average was 20° to 25°, but one was found with 
an inclination up south of 43°. In two cases it was distinctly 
seen, that the ruts were deepest and widest at their north ends, 
thus ~ Mr Millar found the 
rut, 13 feet long, was at its north end 1 \ inch wide, and fths deep ; 
another was 2 inches wide at its north end. These tapered to a 
point at their south ends. The graving tool, which had been 
sharp enough to cut deeply at first, becoming blunt by pressure 
on the rock, would naturally leave a smaller and fainter striation as 
it passed along. 
These marks seemed to make it quite clear, that some powerful 
current had passed through the gorge, carrying fragments of rock 
and stones, and squeezing them up over the summit level. In no 
other way, would it be easy — indeed possible, to account for the 
smoothed surfaces at the sides of the gorge, and especially for 
the striations, sloping upwards, and cut most deeply at their 
north ends. 
There were no boulders in the gorge itself ; but on going to the 
summit level, and looking south upon the moors and hill slopes 
beyond, boulders were observed not far off, which may have come 
through the gorge, and been carried some distance. 
There was no time that day, for further research. But Mr Millar 
kindly undertook, at some future period, to visit those parts to the 
south of the Barone Hill, and report on any boulders seen by him. 
The result of his survey will be seen in the last part of the notes 
sent by him, already given. It confirms the supposition, that 
boulders were carried through the gorge, and were strewed over the 
hills to the south. 
On returning to Rothesay by a route to the north of the principal 
hill, several small gneiss boulders were observed on a bit of flat 
