_The Bureau of Fisheries_ has control of fish hatcheries in many parts of the country, for the propagation of useful food fishes; studies fish culture and the causes of the decrease of food fishes; collects statistics in regard to the fishery industry; and in general promotes the fishery interests. It supervises the salmon fisheries of Alaska and the fur seal industry on the Pribilof Islands of the Bering Sea. _The Bureau of Lighthouses_ is charged with the construction and maintenance of lighthouses, light vessels, beacons, fog signals, buoys, and other aids to navigation. The seaboard is divided up into lighthouse districts, in each of which is a naval officer who serves as inspector and has immediate charge of the supply, maintenance, and administration of the lighthouses in his district. At each lighthouse there is a keeper and one or more assistant keepers. The establishment now consists of more than 1,500 lighthouses and beacons, a fleet of light-ships, and more than 6,000 buoys. Since 1910 the service has been under the supervision of a commissioner. _The Bureau of Standards_, established in 1901, is charged with the custody of the national standards, the testing of measuring apparatus, and the investigation of problems relating to standards of weighing and measuring. _The Coast and Geodetic Survey_ is charged with the survey of the coasts and of rivers to the head of tide water, and the publication of charts of the same; the investigation of questions relating to temperature, tides, currents, and the depths of navigable waters; the making of magnetic observations; the determination of geographic positions, and the like. The results are published in annual reports and special publications. It prepares tables, sailing directions, charts of the coasts, harbor charts, notices to mariners, and other publications for the use of mariners. _The Bureau of Foreign and Domestic Commerce_ is charged with fostering and developing the various manufacturing interests of the United States and extending the markets for manufactured articles abroad, by collecting and publishing all available and useful information concerning such markets and industries. It publishes statistics of commerce, finance, etc., consular and trade reports, and an annual volume known as the "Commercial Relations of the United States."