There was a very ancient and remarkable light at Boulogne. It was said to have been first built by the Emperor Caligula, in order to perpetuate the victories he meant to win. It became, however, of great service as a lighthouse-tower, and it is thought that, as early as the year A.D. 191, it flashed a friendly light across the sea. Time, however, and the repeated assaults of foes, robbed it of its strength and glory. The men of Boulogne allowed it to perish, and then thought they were free of all obligation. The case, however, was tried in court, and they were sentenced either to restore it, or pay two thousand herrings, delivered fresh and dry every year. Very early, indeed, there was a light-tower in our own land, on the cliff at Dover, relics of which may even now be seen. It was built by the Romans, of very strong material, tufa, concrete, and red-tile brick. It was probably used as a lighthouse about the time of the Norman conquest, and is now devoted to purposes of government storage. The Colossus of Rhodes is said to have been used as a beacon, but there is no proof that it was so. Englishmen are notorious for the facility they have of making money, and some enterprising men among our forefathers lighted beacons along the coast, and levied tolls upon those who benefited by their light; and James I. used to sell this privilege to his subjects. In the diary of Lord Grenville, is found this entry--"Mem. To watch the moment when the king is in a good temper to ask of him a lighthouse." This plan, however, was not very effective, and the public grew increasingly dissatisfied with it until, in the reign of William IV., the Corporation of Trinity House was empowered to buy up all lighthouses, take possession of all privileges, and have the entire control of the lighthouse system. There are between three and four hundred members of the Corporation, amongst whom are the Prince of Wales, the Duke of Edinburgh, who has the title of Master, and Mr. W. E. Gladstone. The active committees are composed of retired captains. They have to give certificates to properly-qualified pilots, attend to sea-marks, to the ballast of the Thames ships, and many other things. There are two other Corporations besides that of Trinity House--namely, the Commission of Northern Lights, and the Board of Ballast of Dublin; and all these are under the control of the Board of Trade. The total number of lights in England is 286, in Scotland 134, and in Ireland 93. So well is our coast lighted that it is said to be impossible to arrive near a dangerous point without seeing a warning lighthouse in some direction. They are of many different kinds and colours, some being placed on towers, some on sand-banks, some in ships out at sea, some on pier-heads, and in harbours. There are five principal lights, the "fixed," the "flashing," the "revolving," the "intermittent," and the "double lights," in one tower.