The comes commercii; or, Merchant and trader's companion : Containing, useful tables, shewing the value ... of goods or wares ready cast of more ... merchants' use, than any other extent. ... an ingenious accomptant. To which is prefixed, ... and Half Guineas, from J. ... 2 and 1/2, and progressively to 250, carefully ... together with table of the number of yards in the several scores of linen, from 1 to 150. ... last calculated originally, and the whole book last up in manuscript, and corrected at the Press, By John Watson, bookseller.