418 MR MILNE ON THE PARALLEL ROADS OF LOCHABER. 



and worn down, and sudden depressions of lakes would take place, leaving marks 

 of horizontal shelves along the sides of valleys. 



The progress of these important changes is indicated, in many parts of the 

 country, by the existence of haughs or river-flats, far above the present channels 

 of the streams, and which evidently had been formed when they flowed at a 

 much higher level. 



Thus, from Perth up to Loch Tay, a number of isolated flats or terraces oc- 

 cur, forming a pretty uniform level, rising gently inland, and at a rate rather 

 faster than the slope of the river. Near Perth, these old haughs are from 90 to 

 1 00 feet, and at Dunkeld about 1 10 feet, above the river. This old haugh at Dun- 

 keld may be traced on both sides of the valley, — Dr Fisher's house being on it at 

 the east side, and Claypotts farm-house on it at the west side. It may even be 

 traced a considerable distance up botl) sides of the Braan, where it slopes a little 

 to the eastward. 



There is a low haugh at Dunkeld which is only about 20 feet above the pre- 

 sent bed of the river, and is, therefore, quite distinct from the higher terrace 

 above described. The ground is now cultivated and enclosed ; so I suppose that 

 the floods never rise to a level with it now. 



On the Tweed, in like manner, the remains of ancient haughs can be traced 

 in many part of its course. About half a mile above Berwick Bridge, one may 

 be seen on the south side, from 30 to 32 feet above the sea. At Gainslaw, it is 

 44 feet ; opposite to Finchie, it is 55 or 56 feet ; opposite to Paxton, it is 58 feet ; 

 at Norhara, it is 93 feet above the sea. 



At New Rattray (in the parish of Blairgowrie) I observed an extensive flat, or 

 ancient haugh, with its cliff or bank about 80 feet above the River Ericht. 



On the Isla, above Airley Castle, there is haugh land, on both sides, about 30 

 feet above the present level of the river. 



On the River Garry, about 3.V miles north of Blair, there are on the east side 

 two terraces, the one about 30 and the other about 50 feet above the river ; but 

 whether they are the remains of ancient haughs, or the beaches of a lake, it is 

 difficult to determine. 



