From this whispered aside, let us turn back to the Grahams of Menteith. At last the race began to flourish steadily in the new dukedom seated on Loch Lomond, forgetting its feuds with Argyll and overcoming its guerrilla neighbours, Macgregors and such-like. The Grahams may now look on themselves as a great clan that has absorbed the sentiment of the heather and the forest among which they made clearings. But they surely came from the south, one sept of them seen by Scott at home in the Debatable Land on the English border. The very name has a hint of darkly dubious origin. One ancient warrior of the race is said to have broken through the Roman wall, which, in memory of that exploit, became known as Graham’s Dyke. But the name Graham’s Dyke turns up in other distant parts of Britain--as, for instance, on Harrow Weald by the house of that dealer in modern “magic and spells,” Mr. W. S. Gilbert, where it is more plausibly interpreted as Grim’s Dyke, a name given in awe by rude Saxons to what seemed the work of supernatural hands, such as near Brighton, with a flourish of legend, has been bluntly christened the Devil’s Dyke. The Grahams had best look out for another forefather. _Quelle généalogie!_ as a Czar of Russia exclaimed in amazement, when he had interpreted to him at the Mansion House that an unknown uniform denoted _un frère aîné de la Trinité_. We know how more than one “Dyke” was run across the country as a barrier against naked hosts of the North. But this part of the Highland line had a natural boundary in the Forth, of which the saying was that it “bridled the wild Highlandman.” Swimming is an accomplishment given by Scott to Malcolm Graeme and other of his heroes; but it was not common among Highlanders of the last generation; and I am doubtful how far a poet had authority for the statement-- We _swam_ ower to fause English ground And danced ourselves dry to the pibroch’s sound. The young Forth, known in its cradle as the _Avon Dhu_, soon gathers strength as it drains the flats of Flanders Moss, which is taken to be the dregs of a forest cut down by Roman soldiery; and its only safe passage, even that impracticable in spate weather, was by the Fords of Frew, where Rob Roy made his bold escape from Montrose’s horsemen. This point proved so important as to be guarded by a fortalice, when there was no wale of bridges on the Highland line. Scott confesses to an anachronism in accommodating Aberfoyle with a bridge in Rob Roy’s day. The first bridge was at Stirling, one of great antiquity, as shown by the part it played in Wallace’s victory over the English knights heedlessly divided on the crossing. A public-spirited tradesman of Stirling, Robert Spittall, “Tailor to King James IV.” built a bridge over the Teith at Doune, as an inscription upon it records. Once across this, an invading army from the North had still to pass the Forth, its bridge guarded by Stirling Castle.