in Scotland and the North of England. 101 



tween. Now, where the Thirlmere valley enters this valley 

 of passage, near the Wythburn Inn, we see a remarkable- 

 looking double ridge descending the hillside. It is prominent 

 above the general outline of ground, to the height of about 

 thirty feet, and its surface is bristled with blocks. This double 

 ridge precisely answers in form and relative situation to the 

 character of such a moraine as that of Les Tines, connected 

 with the Glacier des Bois of Chamouni. It is the train of 

 detritus which a glacier three or four hundred feet deep, 

 coming down the Thirlmere valley, would throw over and 

 leave, at two stages, on the face of the valley of passage in 

 which we find it. The constituent rocks are the same as those 

 of the valley. Further down the vale of Thirlmere, there are 

 many other heaps of the like detritus (along with rounded, 

 grooved, and scratched rocks), but none that take so signifi- 

 cant a form as this. It is also to be observed that glacialised 

 rock faces abound in the valley above the point where it joins 

 the valley of passage. 



Some late observations tend to confirm my former propo- 

 sition, that there are two sets of glacial phenomena, widely 

 different in extent, and separated in time. 



The well-known mountain of Schihallion in Perthshire, 

 rises from a plateau about 1100 feet above the sea, to the 

 height of 3600 and upwards. It is composed of quartz 

 rock, and . to the comparative hardness is due the preemi- 

 nence, which (with one exception), it has over all the neigh- 

 bouring mountains. This great mountain is abrupt to the 

 westward, and tails away to the east, precisely like the 

 many hills in the valley of the Forth, which are regarded 

 as taking their form from glacial action. The top of the 

 ridge being thickly strewn with loose slabs, shows such a 

 tendency to peeling under a denuding agent, that it seems a 

 very unlikely place for the discovery of glacial smoothings 

 and scratchings. Nevertheless, I found surfaces at several 

 places, bearing that peculiar streaking which I had remarked 

 some years ago as a glacial phenomenon peculiar to quartz 

 rock on the mountain of Queenaig in Assynt. About half 

 way up from the plateau, and certainly not less than 2200 

 feet above the sea, — a point where we are above the summit 

 of Ferragon, the most conspicuous mountain to the eastward, 



