REDRUTH, a market-town and parish in the hundred of PENWITH, county of CORNWALL, 49 miles (S. W. by W.) from Launceston, and 262 (W. S. W.) from London, containing 6607 inhabitants. This ancient town, originally called Uny, subsequently received the appellation of Dre druth, or " Druids' town," of which its present name is evidently an abbreviation. It appears to have existed previously to the division of the kingdom into parishes, and to have been a central point for the exercise of the religious rites of the ancient Britons, of which the adjacent rocks, basins, circles, and erect stones, with numerous remains of cromlechs, cairns, and other objects of superstitious veneration, are standing memorials; especially one rock, formerly the scene of human sacrifices, and therefore called " the Sacrificing Rock." The town is situated on. the brow of a hill in the midst of the mining district, and consists chiefly of one long street, which is indifferently paved, lighted with gas, and supplied with water from a spring near Trefula. A small theatre is open occasionally, and there is a subscription reading-room. A savings bank has been recently erected; it is a handsome edifice, with a colonnade in front. The prosperity of this place, and the rapid increase of its population, have been eminently promoted by the discovery of extensive tin and copper mines in its neighbourhood, the produce of which is said to realize nearly a million sterling per annum. Sales of copper-ore are held weekly by ticket, and there are several very extensive stores of gunpowder, tools, and other articles, for the use of the miners; some hats are manufactured here. A railroad, about nine miles in length, recently constructed, under the provisions of an act obtained in 1824, from Point quay, in Restrongeth creek, to this town, and also communicating with a branch of the river Fal, facilitates the exportation of ore, and the conveyance of timber and coal, for the supply of the mines, and for general purposes. A market and two annual fairs were granted by charter of Charles II., and a third fair by Henry VII. Markets are now held 011 Tuesday and Friday, the latter of which is a great corn market, especially. for oats. Fairs are on Easter-Tuesday, May 2nd, August 3rd, and October 12th, chiefly for cattle; the tolls and dues of the markets, and of the fairs in May and August, also those of a fair commonly called Roast Goose fair, belong to Lord De Dunstanville, who, as lord of the manor, appoints examiners of weights and measures. A market-house, shambles, and other buildings, have been recently erected, at the expense of his lordship. At the entrance to the market- place is a handsome square stone tower, built on arches, and ornamented with a clock, having four dial plates, which is lighted with gas, on the east and west sides. The living is a rectory, in the archdeaconry of Cornwall, and diocese of Exeter, rated in the king's books at £20, and in the patronage of Lord De Dunstanville. The church, which is dedicated to St. Uny, and situated about half a mile from the town, near the foot of Carn- Brea Hill, was rebuilt about 1770, and consists of a nave, with a flat ceiling supported by pillars. A chapel of ease, in the ancient style of English architecture, has been erected by subscription, aided by a grant from the commissioners for building churches and chapels; but is yet in an unfinished state. There are places of worship for Baptists, the Society of Friends, and Primitive and Wesleyan Methodists. A free grammar school was built by subscription in 1803, and supported for some time by voluntary contributions, but is now used only for pay-scholars. On the eastern side of Carn-Brea Hill are the ruins of a castle, parts of which are of great antiquity. At the village of Plain an Quarry, in this parish, are the remains of one of those circles in which the ancient plays were performed. The application of gas to the purposes of domestic light, as a substitute for candles and oil, was first made here, by Mr. Murdock, and afterwards successfully introduced by him into the Soho foundry at Birmingham.