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 
100 feet, and at Dunkeld about 110 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 both 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 Norham, 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 34 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. 
