is six inches in diameter, and consumes paraffin oil at the rate of eighteen gills per hour. To maintain this supply, a forty gallon tank of polished brass is placed on the lightroom floor; and a small force pump, with triple plungers, working in conjunction with the revolving machine, maintains a constant supply of oil, which is kept cool by circulating within an inch of the burning edge of the wicks, the surplus oil returning to the pump-tank. The flash, on being transmitted through the lens, is reckoned to be equal to 60,000 candles; and the characteristic of the light--a red and white flash alternately every half-minute--visible twenty miles distant.” A description of the work of renewal of the lighting apparatus and the erection of a new and enlarged lantern to hold it on the top of the tower, is also given in the Notes; and no further reference to it is needed than to say that the light, which has the same characteristic as before, is now, by means of the new apparatus, made much stronger and more brilliant. Such an erection as this lighthouse--standing, as it were, a pillar in the ocean, with a stormy sea raging round it--may surely be described as one of the noblest and most wonderful works of man. As no ship has been wrecked on the Rock since the light was first exhibited, it is incalculable how many valuable lives may have been saved by it. Sir Walter Scott, on the occasion of his visiting the Bell Rock as the guest of the Commissioners on their annual tour of inspection in 1814, gave beautiful expression to his feelings in the following appropriate lines, which he wrote in the Lighthouse Album:-- PHAROS LOQUITUR. Far in the bosom of the deep, O’er these wild shelves my watch I keep, A ruddy gem of changeful light Bound on the dusky brow of night; The seaman bids my lustre hail And scorns to strike his timorous sail.