Minneapolis is the principal industrial, commercial and financial centre of the North-west, with an immediate trade territory em bracing Minnesota, North and South Dakota, Montana, and the northern part of Nebraska, Iowa, Wisconsin and Michigan. It is the seat of the Ninth Federal Reserve Bank, serving a territory in which there are 1,368 banks. Deposits in the 18 local banking institutions amounted to $369,568,000 on March 1, 1937; and debits to individual accounts aggregated for the year 1934. The 923 factories and 993 wholesale houses had a total annual business of $689,367,548 during 1933.. With the com pletion of improvements undertaken by the U.S. Government in 1894, navigation of the Mississippi up to the heart of the city was opened on July 3, 1917, when the first steamer passed through the new lock and tied up at the new municipal dock. Since then a revival of river traffic (for freight) on the Upper Mississippi has set in, and this will be an important supplement to the transport facilities afforded by the ten trunk railways and numerous motor truck lines which focus at Minneapolis. The terminal yards of the railroads have a capacity of 35,00o freight cars; and 623,790 were received and despatched in 1927. The enormous water-power of the Falls of St. Anthony, of which 6o,000 h.p. is utilized, was the original factor determining the development of Minneapolis as a manufacturing centre. The perpendicular fall of the water is about 5o f t. and the rapids below add about 35 ft. In 1868 erosion of the soft limestone ledge threatened to destroy the source of power, but the loss was averted by the construction of a series of dams, a wooden "apron," and a concrete floor (com pleted 1879) at the joint expense of the U.S. Government and the citizens of Minneapolis. Flour-milling has long been the city's chief industry. The vast lumber industry, developed earlier and for many years equally important, reached its peak in 1899, with an output of 600,000,000 board feet, and then gradually dwindled, as the pine forests were exhausted and replaced by wheat fields, until in 1920 the last saw-mill went out of existence. The flour mills have a daily capacity of 49,259 bbl., and the grain elevators can store 92,190,050 bushels. The total output of the mills in 1935 was 6,636,159 barrels. Minneapolis is still the largest primary wheat market and the largest producer of flour and other grain products in the country, but since the World War reduction of freight rates via the Great Lakes has operated to transfer some of the grain trade and milling business to Buffalo and other points in the East. It is one of the world's largest markets for high grade butter, its own creameries producing $5,856,189 worth in 1929, and it is the largest flaxseed market and producer of linseed oil and cake, with mills having a capacity of 16,500,000 bu. of flax, 893,00o bbl. of oil, and 337,00o tons of cake. Other manu factures are electrical machinery ; furniture ; confectionery ; foun dry and machine-shop products ; structural and ornamental iron work. Seven of the railroads have construction and repair shops in the city, employing together some 3,631 men. The aggregate factory output in 1933 was valued at $170,788,548. These products were manufactured by 923 establishments employing 23, 447 workers, who earned an aggregate of $21,820,601 for the year.