130 Proceedings of the Royal Society 
grooves, some of them 4 or 5 feet in length. One of them, at its 
H. W. end, measures 8 inches across, and 2 inches in depth ; another 
measures at its N.W. end, 12 inches in width, and 1J inch in 
depth; another 9 inches in width, and 1J inch in depth. These, 
and most of the others, show a greater depth and width at their 
H.W. than at their S.E. ends. In fact, they all gradually lessen and 
disappear towards the S.E. 
At this place, the smoothed faces of the rock slope at an angle of 
10° or 12° to the westward. 
7. There is another exposure of well rounded, smoothed, and 
striated rocks, close to the Ferry between Benbecula and Uist — 
i.e., about half a mile to the west, on the south side of a bye 
road. The rocks are here, as at the place last mentioned, of hard 
gneiss, and most beautifully polished. They had been covered by a 
bed of clay containing numerous hard pebbles, a portion of the bed 
still remaining upon the polished rock. Here, as at Jocar, some of 
the grooves are several inches in width, and as much as 2 inches 
in depth, and several feet long. The deepest and widest ends are 
also, as before, at the N.W. 
One of the rounded rocky bosses is polished not only on the top 
but at the sides, as shown on fig. 20. Having regard to the bearings 
of the knoll, which is elliptic in shape, the polishing and striation 
on both sides could have been effected only by a current flowing 
from the N.W.* 
8. On the road between Grogarry (the mansion-house of Mrs 
Gordon of Cluny) and Loch Skiport (on the east coast), the 
following places of interest were observed : — 
At about 1^ mile from Grogarry, on the south side of the road, 
the hard gneiss rock, which had recently been uncovered, was 
found to have been ground down and polished into extensive surfaces 
dipping H.N.W., at an angle of about 20°. These surfaces were 
covered by innumerable striae, and by several ruts and grooves — all 
running in a direction E.S.E. up the face of the rock at an angle of 7° 
or 8°. It is very probable that a current from the N.W., loaded 
* These two beautiful examples of rocks, smoothed and striated, at Jocar 
and at the Ferry, were pointed out by Alexander Carmichael, Esq. , Creagorry, 
who resides near the Ferry. Both he and Mrs Carmichael took much interest 
in the Convener’s researches, the latter kindly giving to him sketches which 
she had made of several interesting boulders, 
