[C] St. AGNES is situated on the Bristol Channel. The town and parish, including a considerable mining district, is thickly strewed with the cottages of the miners. It is more frequently called Lighthouse Island, from a very high and strong light-house erected here, to warn the mariner from the rocks, which are more numerous about this than any other of the Scilly Islands. This building is upwards of sixty feet high, and stands on the most elevated ground. The light is produced by twenty-one parabolic reflectors of copper, plated with silver, and having each an argand lamp in its focus. The reflectors are disposed of in three clusters, of seven in each cluster, and the frame in which they are fixed stands perpendicularly to the horizon, on a shaft united to a machine below, which makes the whole revolve every two minutes. By this motion the light progressively sweeps the whole horizon; and by its gradual intermission and increase, it is readily distinguished from any other. Its brilliancy is also extraordinary; and by these combined efforts its benefits are greatly increased, as the seaman is at once rendered completely sensible of his situation. This light was designed by the ingenious Mr. Adam Walker, (lecturer on natural and experimental philosophy,) under whose inspection it was constructed. The light-house itself is of stone, and was erected, as appears from an inscription over the door, by Captain Hugh Till, and Captain Simon Bayley, in the year 1680. The charges attending the light are defrayed by the Trinity House. At St. Agnes is a pilchard fishery. St. Agnes' Beacon, six hundred and sixty-four feet above the level of the sea, is formed out of an ancient cairn, or tumulus of stones; near which, a summer-house has been built, from whence is a fine view of St. Ives, and an extensive sea prospect. Near the same spot is St. Agnes' Well, of which many miraculous stories are in circulation, from its presumed holy and sanative properties.