book of rates established in the twelfth of Charles II. The method of ascertaining, by a book of rates, the value of goods subject to this duty is said to be older than the time of James I. The New Subsidy imposed by the ninth and tenth of William III was an additional five per cent upon the greater part of goods. The One-third and the Two-third Subsidy made up between them another five per cent of which they were proportionable parts. The Subsidy of 1747 made a fourth five per cent upon the greater part of goods; and that of 1759 a fifth upon some particular sorts of goods. Besides those five subsidies, a great variety of other duties have occasionally been imposed upon particular sorts of goods, in order sometimes to relieve the exigencies of the state, and sometimes to regulate the trade of the country according to the principles of the mercantile system.