Glaciers and Icebergs in Scotland. 129 



south side remains rough, a fact which admits of easy expla- 

 nation. 



The finest exhibition of large grooves is at c, and was 

 pointed out to me by Professor Clarke of Aberdeen. There 

 is a cottage here with some outhouses, called Fernbreak, 

 fully half a mile from the loch, and perhaps 60 feet above it. 

 In front of the cottage and behind it there are^long horizontal 

 cavities in the rock, quite straight, with the usual SSE. bear- 

 ing. They are from 3 to 4 feet in breadth, and from 2 to 4 

 inches in depth. But the best marked groove is 100 or 200 

 feet north of the cottage. It is 2 feet 9 inches in breadth, 

 about 2 inches deep, and is exposed on the level surface of 

 the slate for a length of 10 feet. The cavity is as straight, 

 and uniform in its curve, and its margin as well defined, as 

 if it had been cut by a mason for an open sewer. 



The strise are visible at a few points on the west side of 

 the loch between b and g. They are less numerous than on 

 the other side, but there is much less rock exposed. They 

 are well seen at e, about 100 feet above the loch, and the 

 dressings, as usual, are found everywhere. 



I found two distinct groovings, 5 or 6 inches wide, 310 

 feet above the loch, on the hill k, the top of which forms a 

 tolerable specimen of the roche montonme. At a little cairn 

 on the hill/, 460 feet above the level of the loch, I found one 

 small groove, but not very distinct. At higher elevations I 

 saw none, but surfaces dressed or smoothed by abrasion were 

 never wanting. 



In the lower part of Gare Loch there is not much rock ex- 

 posed on the beach ; but, at Row, 5 miles from the head, there 

 are striae beautifully cut on a surface of clay-slate, which is 

 inclined at 12 or 15 degrees to the SW. Here, also, they run 

 across the planes of stratification, and retain the usual SSE. 

 bearing. They are of various sizes, and I was particularly 

 struck with one groove about 16 inches broad, and extremely 

 well defined. 



I was thus able to trace the phenomena from the shores 

 of Loch Long, nearly to the foot of Gare Loch, a space 7 miles 

 in extent, over the whole of which the bearing of the striaB 

 does not vary more than a point to the right or left of the 



VOL. XL. NO. LXXIX.— JANUARY 1846. I 



