The United States is divided into sixteen lighthouse districts, each one with its inspector and engineer. The former, drawn from the navy, inspects the lights under his jurisdiction at least every three months; the latter, a member of the Corps of Engineers, superintends the building, removal or renovation of the towers. Both are responsible to the Lighthouse Board, a body appointed by the President and composed of veteran naval officers of high rank, who are no longer fitted for active duty at sea. The station of the third lighthouse district is on Staten Island, between St. George and Tompkinsville. Here over a hundred men are constantly employed and half a million dollars annually expended. From this station one hundred and eighty-nine lighthouses and beacon lights and seven lightships are maintained and supplied, while thirty-six day or unlighted beacons, thirteen steam fog signals, six electric light buoys, and five hundred and seven other buoys are looked after and kept in repair by the inspector and his assistants. Fog often obscures the rays of the most powerful light, and it is then that the fog signal and the whistling buoy come into play. The most effective fog signal is the American siren, a steam machine worked under seventy pounds pressure, and from which a series of noises come forth that can be heard from two to four miles. Certain intervals in the sounds designate the nearest light and afford a welcome and often much-needed guide to the mariner enveloped in a cloak of fog. This system of fog signals extends along the entire seaboard, extra precautions being taken on the Northern Atlantic coast. Mineral oil is the principal illuminant used in our lighthouses. It is selected with the greatest care, and is subjected to three several tests before being accepted. Gas has been tried as a lighthouse illuminant, but with inferior success, and there are at the present time only three lighthouses in which it is used. Experiments with electricity have also been only fairly successful, its light blinding instead of giving aid to the pilot. The lighthouse station on Staten Island is a busy place, and much work is done there, but the wheels of industry are so well oiled and run so smoothly, that a deep peace seems always to brood over the establishment. Day after day and year after year the work, moving in well-marked channels, goes on with quiet and certainty. Everywhere the neatness and order prevail that mark all departments of the lighthouse service.