CROSTHWAITE, a parish, in ALLERDALE ward below Derwent, county of CUMBERLAND, comprising the chapelries of Borrowdale, Newlands, and Thornthwaite, and the townships of Braithwaite and Coledale, or Portingscale, in ALLERDALE ward above Derwent, and the chapelry of St. John Castlerigg with Wythburn, the town of Keswick, and the township of Under Skiddaw, half a mile (N. by W.) from Keswick, and containing 4087 inhabitants. The living is a vicarage, in the archdeaconry and diocese of Carlisle, rated in the king's books at £50. 8.1If., endowed with £300 private benefaction, and £ 800 royal bounty, and in the patronage of the .Bishop of Carlisle. The church, dedicated to St. Kentigern, an ancient fabric, was roofed with slate in 1812, having been previously covered with lead. Adjoining the churchyard is a free grammar school, founded and endowed prior to 1571: the income is about £ 100 per annum, of which £65 is paid to the master, and £30 to the usher, for teaching one hundred and twenty children; the remainder is applied for repairing the school-house, which was built at the expense of the inhabitants. Near the source of the Derwent are two saline springs, in great repute among the inhabitants. This parish produces copper and lead ores, with plumbago, or black lead, and abounds with numerous interesting objects, for a description of which see KESWICK.