Immediately to the south of the small bay of Greyhope stands the Girdleness Lighthouse; an erection by which the trade of Aberdeen has been greatly benefitted. The Girdleness, from which it takes its name, is a conspicuous promontory of which the Commissioners of the Northern Lights took advantage to erect this monitory beacon: it was lighted up for the first time on the night of the 15th of October, 1833, and is a lofty, circular tower, built of granite, and crowned with two copper domes, one within the other, in order to prevent the effects which would follow from the condensation of vapour from the heated air of the lamps. The dwelling-houses of the keepers are at the bottom of the tower; and a field of considerable extent has been walled in and cultivated for their accommodation. It is on the larboard, or left-hand side, as we enter the port, and is known to mariners as a _double-light_, a distinction produced by placing two lights in the same tower, the one above the other. Of these, the lower light is visible in clear weather at the distance of thirteen, and the higher at that of sixteen miles. They are under the charge of two keepers, one of whom mounts guard at sunset, and in case of emergency can summon assistance by means of an alarm-bell, placed in the sleeping apartments, which may be rung from the light-room, by means of an air-blast, through tubes laid for that purpose. This edifice, of incalculable benefit to the cause of humanity, was erected after the design of Robert Stevenson, Esq., and does great honour to his talents. The bay of Greyhope, above-named, is memorable as the scene of many a disastrous shipwreck, particularly that of the Oscar, in which, out of a crew of forty men, only two were saved. This occurred on the 1st of April 1813.