THE LICHENS OF PERTHSHIRE 3 
Schiehallion (3547 ft,), and Ben Haesgarnich (3530 ft.). The 
ighest summits of the Ochil Hills within the county are Blair- 
denon Hill (2072 ft.) and Core Hill A 780 ft.), whilst the Sidlaw 
Hills average about 1000 ft. only, I erie s Seat (1235 ft.), Black 
Hill (1182 ft.), and Kinnoull Hill (729 it.). 
As indicated above, the line of demarcation between the 
aan and the Lowlands passes diagonally across the county 
n a north-east and south-west direction, and corresponds to the 
ine of a ss geological fault which we shall refer to again later 
be traced from near Alyth, by Birnam, Comrie, and 
Callander os Aberfoyle. The region between this line and the 
Ochil and Sidlaw Hills forms the broad and fertile valley of 
Strathmore. 
With the exception of a small portion of the extreme west of 
Perthshire, st by the river Falloch, the water from which 
flow. west coast by way of Loch Lomond, the whole of 
important, so far as the county under consideration is concerned, 
is the Tay. is fine river, the longest in — cotland, has a cour 
of over one hundred miles, and with its numerous large tribu- 
taries, all of which flow through long and beautiful glens, has a 
drainage area of nearly 2000 square miles, or four-fifths of the 
total area of Perthshire. It rises on Ben Laoigh at the boundary 
of Argyllshire, and after a course of fifty-five miles, during which 
it passes through Loch Tay, it is super by a stream of almost 
equal volume—the river Tummel, from the Moor of Rannoch and 
Loch Ericht. Other well-known iikalaties of the Tay are, on 
its left bank, the Lochay, the Lyon, and the Isla, and, on its right 
bank, the Bran, the Almond, and the —_— * The chief Perth- 
shire streams which discharge to the river Forth are the Devon, 
which rises on the Ochil Hills, and cha! Teith, from Loch Katrine 
and Balquhidder. Many of these Perthshire rivers flow during 
some parts of ce course through beautiful lakes. The largest 
are Loch Tay, Loch Earn, and Loch Rannoch in siecret agpei 
Loch Ericht on the confines of Perthshire and Inv 8; a 
Lochs Katrine and Venachar in the well- “a district poe ne ie 
Trossachs. 
The “crear of Perthshire in 1911 was 124,339, of which 
36,669 are ined in the town of Perth. The towns of Crieff 
and Daabhine ont for a further 10,680. Large areas of the 
previously stated, are oa uninhabited. Of the total area, 
1,596,160 acres, only about 340,000 acres are, more or less, culti- 
vated. Over 90,000 acres oe mk present covered with wood, but 
more than double this area is said to be suitable for afforestation. 
By far the largest proportion of the county—over one million 
* A further well-known Perthshire wal which been ine ‘case tunes is 
the Garry, a tributary of the Tummel. 
and after receiving the drainage from the Podenk of Atholl paces reaetng ‘the 
famous Pass of Killiecrankie. 
