The _Import Duty_ in foreign vessels is fourteen per centum, Spanish; the _Export Duty_, three per centum, excepting on hemp, which is free. The importations for the year 1831 amounted to one million, seven hundred and ninety-four thousand, three hundred and seventy-nine dollars; the exports for the same period, to one million, four hundred and fourteen thousand, seven hundred and ten dollars. The gold and silver imported, amounted to three hundred and thirty-seven thousand, two hundred and eighty-seven dollars, and the amount exported, on which duties were paid, was forty-nine thousand, two hundred and nineteen dollars. A large sum in gold, silver, and in the dust produced in the island, is smuggled out of the country, principally by the Chinese. _Weights._--The quintal is four Spanish arrobas of twenty-five pounds. The picul is here one hundred and thirty-seven pounds, Spanish, or one hundred and forty pounds, English. The _currency_ of the island is dollars and their parts, and doubloons; the latter being worth sixteen dollars. _Exchange_ on London was four and a half prem.; on Canton, two per cent. discount: but it necessarily fluctuates very materially. The _imports_ are British, India, and China goods, wines, sheathing copper and nails, iron and steel, cocoa from Peru, &c. During the southwest or foul monsoon, the shipping lies at Cavité, and in the northeast or fair monsoon, (from October to April,) from three to five miles from the entrance to Pasig, below the bridge which unites Manila with Binondo. [Sidenote: POPULATION--TAXES.] The _population_ of the archipelago of the Philippine islands, according to the returns made, in the year 1792, was one million, four hundred thousand, four hundred and sixty-five; in 1805, one million, seven hundred and thirty-nine thousand, two hundred and five; in 1812, one million, nine hundred and eleven thousand, five hundred and thirty-five; in 1815, one million, nine hundred and twenty-seven thousand, eight hundred and forty; in 1817, two millions, sixty-three thousand, three hundred and ninety-five; in 1818, two millions, two hundred and forty-nine thousand, eight hundred and fifty-two.