NATURE AND MAN IN THE FORTH VALLEY. Th 
highest peak is Stobinean, 3827 feet, and there are 12 
summits over 3000 feet, and 24 over 2500 feet. [Over 
3000 feet are Stobinean, Stob Coire an Lochan, Am Mam, 
Stob Garbh, Cruach Ardran, Ben Tulachan, Ben a Chroin (3 
summits), Ben Chabhair, Ben Lomond, and Stue-a-Chroin. 
Over 2500 feet, the foregoing twelve and Meall ant Scallaidh 
(8 summits), Stob Creagach, Stob Glas, Stob-a-Choin (3: 
summits), Ben Vane, Ben Ledi, Ben-a-Choin, and Ben Each.] 
The eroding forces were the glaciers of the ice age and the 
swift flowing streams which succeeded them. There are 
three principal valley systems piercing the plateau, each 
occupied by its chain of lakes. The most northerly is the 
hollow occupied by Loch Doine, Loch Voil, and Loch 
Lubnaig, which formed one single loch at no very distant 
period. The uext valley contains Loch Katrine, Loch 
Achray, Loch Drunkie, and Loch Vennacher. The third has 
Loch Chon and Loch Ard. Some of these lochs are of 
considerable depth, Sir John Murray and Mr Pullar having 
sounded a depth of 495 feet in Loch Katrine. Ancient lake. 
basins now drained are not infrequent—for instance, the 
haugh at Aberfoyle and the circular hollow in Glenbuckie. 
East of the great dividing line before mentioned we enter 
upon the Lowland division of the Forth Valley. It is part 
of the great hollow of Midland Scotland. The Old Red 
Sandstone beds attain great thickness and rise to consider- 
able elevations at Uam Var and the Braes of Doune. A 
fault, prominently marked by the line of the south-eastern 
front of the Ochils, divides the Old Red Sandstone from the 
Carboniferous formation, and east of the fault the different 
divisions of the latter formation appear in succession. As a 
general rule, where the rocks are sedimentary the country 
is soft and low lying. Where the rocks are volcanic, the 
land rises in rough hills. The cause of this is that the soft 
rocks have yielded to denudation to a greater extent, while 
the hard volcanic rocks have resisted the denuding forces, 
and now form prominent features in the landscape. The 
Ochils consist of a succession of interbedded lava flows with 
beds of tuff and agglomerate of Old Red Sandstone age. 
The general elevation of the Ochils is about 1750 feet, the 
highest point being Ben Cleuch, 2363 feet; while 11 summits. 
