In the bleak Moor of Rannoch--the "furthest Thule" of Perthshire and of the more northern Tay sources--there are great blank spaces where the heather itself will scarce grow. There are only grey rock and black marsh--"bogs of Styx and waters of Cocytus," with scarce a sign of human habitation or even of animal life. But the logs of oak found embedded in the peat, and the hoary fir trunks that still keep a stubborn stand by Loch Lydoch and the banks of the Guar and the Ericht, show that even in this dreary region a great forest once waved. The "Black Wood of Rannoch" still clothes the southern side of the fine loch of the name; and here, indeed, the Scots fir is to be seen in all its pride and strength, rising above the beautiful growth of oak and birch coppice, and of heather of almost arboreal proportions. Escaping from Loch Rannoch, the Tummel roars down its rocky bed under the piny slopes and crags of Dunalastair, with a halt by the way in Loch Tummel, where, from the "Queen's View," looking back, a magnificent prospect is had of the lovely lake embosomed in woods and hills, dominated by the lofty shape of Schiehallion, with the lonely Black Mount and the more distant Grampians closing the background. Further down, opposite Faskally, the Garry joins it, mingling the streams of Athole with the waters of Rannoch. Before the meeting, the Garry, leaving its parent lake high up near the borders of Inverness, has tumbled in white foam through leagues of the "Struan country," between banks thinly sprinkled with birchwood and edging great tracts of moorland. Then the Erichdie, the Bruar, and the Tilt bring down their contributions from remote mountain corries visited only by the deer-stalker, through deep wild glens, gloriously wooded at their lower extremity. Where the Tilt runs into the Garry stands Blair, the Highland seat of the ducal family of Athole. [Illustration: BRIDGE OF GARRY.] The date when "Blair in Athole" was first occupied as a stronghold of a powerful Highland chieftain is not told in the eventful annals of the Castle. Strategic considerations, from the points of view of war and of the chase, no doubt determined the selection of the site, inside the rugged jaws of the Pass of Killiecrankie, and on a shelf commanding the routes leading across the Grampians from the basin of the Tay to the valleys of the Spey and the Dee. The choice thus made in ruder days is thoroughly pleasing in these "piping times of peace," when the line of the Highland Railway threads its way through the narrow defile, and keeping the main valley of the Garry, skirts the miles of woodland, opening at intervals to afford peeps of the plain, massive white front of the Castle and the broad spaces of its surrounding parks. The way through Glentilt, traversed by the clans to join the Stuart standard at Blair or on the Braes of Mar, is free now only to the deer and the gillies.