OF LOCHABER. 43 



Muckul, towards the river Spey. Returning down the south 

 bank of the Pattaig, Shelf 4th is to be traced all around the 

 south side of Loch Laggan ; and it exhibits nearly the same 

 appearances on the south side of the river Spean, that I have 

 already described it to do on the north side. As it approaches 

 the river Treig, it sweeps round in the direction of the mouth 

 of the glen and lake of that, name, where, notwithstanding the 

 rocky nature of the mountains, it is found to be very deeply 

 marked. It enters the jaws of the pass into Loch Treig in the 

 manner represented in Plate VI. 



By far the most satisfactory and perfect example, of any 

 shelf completely surrounding the top of a hill, is to be obser- 

 ved on the isolated one of Tom-na-Fersit, immediately oppo- 

 site to the opening into Loch Treig. Shelf 4th is most dis- 

 tinctly and broadly traced around it, at the same level that it 

 appears on the rocks where it enters to Loch Treig. And 

 what is still more worthy of remark, the little hill, having a se- 

 cond and inferior rocky top, rising above the level of the shelf, 

 it is perfectly surrounded also, and detached from the princi- 

 pal summit, so as to give this portion of shelf, which belongs 

 independently to Tom-na-Fersit, the appearance laid down in 

 the map, or to shew it on a larger scale, something like this : 



A and B being the two tops of the hill rising out of the sur- 

 rounding shelf. The rocks on the interior angle of the shelf, 

 are here particularly rounded, and have all the characters of 

 those bounding the edge of low and rocky islands, frequently 

 met with in Highland lakes. Where the smaller top is divid- 



f2 ed 



