§ 10. #Transportation agencies#. First to mention among the means of transportation are the navigable waters--oceans, lakes, rivers, and canals, with the necessary equipment of dredged inlets, harbors, docks, locks, and lighthouses. Few of these appear in the total of "capitals," for they are not in private possession. Yet a good system of natural waterways may be greater wealth to one nation than costly additional railroads are to another. Good natural harbors on the waterways leading out to the oceans are a most important kind of national wealth, as are the navigable great lakes within the boundaries or on the borders of a country. Just in proportion as these natural means of transportation are lacking, is the need to build costly artificial means of transportation. Both in natural and in artificial means of transportation, America is well provided. The straight coast line is 5700 miles long, and the line following indentations of the coast is about 64,000 miles. The Great Lakes with a straight shore line of 2760 miles are the most important inland waterways in the world. The 295 navigable rivers in the country have a length of 26,400 miles of navigable water. About 2000 miles of canals are still in operation. On the waterways some 27,000 American vessels are in use, with a capacity of 8,000,000 gross tons.[7] There are about 250,000 route miles of steam railroads, or with additional tracks, yard tracks, and sidings, a total of about 370,000 miles. On these are over 63,000 locomotives, 52,000 passenger cars, and 2,400,000 freight and company cars. Besides these are 45,000 track miles of electric railways and nearly 100,000 cars. These railroads include an enormous aggregate of works and structures in the form of tunnels, cuts, banks, bridges, stations, and shops. There are in the country (1914) about 2,228,000 miles of public roads, of which 10 per cent are "surfaced" roads. No figures are now available of the number of wagons, horses, automobiles, and other vehicles in use on the roads and streets for purposes of transportation. Many of our economic problems are presented by these transportation agencies, from the question of opening a new dirt road in a rural township to that of building an inter-oceanic canal, from the question whether to have free public roads or toll roads to that of regulating the railroad rates on the whole railroad system of the country. § 11. #Raw materials for clothing, shelter, machinery, etc.# The farm lands supply, besides food, a large part of the raw materials for many other goods, such materials as cotton, flax, wool, hides, feathers, lumber, and firewood. The farm woodlots compose about 200,000,000 acres, and the large forests, public and private, about 350,000,000 acres, a total of about one-fourth the area of the country in forests, containing about one-half of the lumber that the country once possessed. The economic problem of a sound forestry policy is one of the largest we have to solve.