INNERLEITHEN, a police burgh, parish and health resort of Peeblesshire, Scotland, on Leithen Water, near its junction with the Tweed, 61 m. S.E. of Peebles by the L.N.E. railway. Pop. (1931) 2,359. It seems once to have been known as Horne huntersiand, and to have been mentioned as early as 1159. Its chief industry is the manufacture of tweeds and other woollen goods, which, together with the fame of its medicinal springs, brought the burgh into prominence towards the end of the 18th century. The spa, alleged to be the St. Ronan's well of Scott's novel of that name, has a pump-room, well-house, etc. The town is flanked on the west by the hill fort of Caerlee and on the east by that of the Pirn. Farther east, close to the village of Walker burn, are Purvis hill terraces, a remarkable series of earthen banks, the origin and purpose of which are unknown. Traquair house, or palace, on the right bank of the Tweed, is one of the oldest inhabited houses in Scotland, the most ancient portion dat ing from the loth century, and including a remnant of the castle.