126 Charles Maclaren, Esq., on the Existence of 



pearance — and to a great extent the tranquillity — of an in- 

 land lake. On the north, the lofty hills of Argyleshire rear 

 their rugged alpine forms, contrasting finely with the peace- 

 ful shores of the loch, and investing the whole scene with a 

 character of tranquil beauty, combined with grandeur, which 

 is the admiration of every traveller of taste. 



The upper end of Gare Loch is in the mica-slate forma- 

 tion, which extends twenty-five miles to the northward. The 

 rock consists of layers of quartz grains, divided by layers of 

 mica, the mica sometimes passing inta talc or chlorite^ 

 Veins of white quartz, from a line in breadth to five or six 

 inches, are extremely numerous. Their general disposition 

 is conformable to the laminated structure of the slate, but a 

 few run transverse to it at various angles, and where the 

 rock is much weathered, they are seen projecting half an 

 inch or an inch above the surface. The rock is sometimes 

 of a rather loose texture — sometimes so compact and firm a»^ 

 to form a good buildingstone. 



The map (Plate VII.) represents a small tract of country 

 at the head of Gare Loch, and northward to Loch Long. 



G. The north end of Gare Loch, which is here scarcely 

 half a mile in breadth. 



L. Loch Long, which is also very narrow. 



A A''. Hills from 400 to 600 feet in height, which divide 

 Gare Loch from the western part of Loch Long. They con- 

 stitute a peninsula, the form of which is seen in Fig. 2. 



B B'. Hills on the east side of Gare Loch, from 600 to 

 800 feet in height. 



R. The village ofGarelochhead. 



The small figures below the map are sections to shew the 

 configuration of the surface. The upper is a section across 

 the head of the loch, along the line of / G X; in the map. 

 The lower is a section north and south, from Loch Long, w, 

 to Gare Loch, G, passing through the village R The ele- 

 vation of X is probably 500 feet above the sea ; but farther 

 east, about B, the land rises to the height of 1000 feet. 



The short double lines 2ii a b c d efg hi k mark the spots 

 where the striae and groovings are most conspicuous, but 

 they are visible at many other places. 



