EARN, a loch and river, Perthshire, Scotland. The loch is m. long east to west and / m. in maximum breadth. It discharges by the river Earn. On its shores are Lochearnhead (at the south ern extremity of Glen Ogle), which has a station on the railway from Perth to Balquhidder, and the ruins of St. Blane's chapel; Edinample Castle, an old turreted mansion belonging to the mar quess of Breadalbane, situated in well-wooded grounds near the pretty falls of the Ample; Ardvorlich House, the original of Dar linvarach in Scott's Legend of Montrose, and the village of St. Fillans at the foot of the loch. The river, a notable fishing stream, flows out of Loch Earn eastwards with a gentle inclination to wards the south, and reaches the Firth of Tay, 61 m. below Perth. The principal places of interest on the banks of the Earn are Dunira House; the village of Comrie; the town of Crieff; the ruined castle of Innerpeff ray, founded in 161 o by the 1st Lord Maderty, close to which is the library founded in 1691 by the 3rd Lord Maderty, containing some rare black-letter books and the Bible that belonged to the marquess of Montrose ; Gascon Hall, now in ruins, but with traditions reaching back to the days of Wallace ; Dupplin Castle, a fine mansion in Tudor style ; Forgan denny, and Bridge of Earn, a health resort situated amidst pic turesque surroundings. Strathearn, as the valley of the Earn is called, extending from the loch to the Firth of Tay, is a beautiful and, on the whole, fertile tract, though liable at times to heavy floods. The earl of Perth is hereditary steward of Strathearn.