TO THE RIGHT HONOURABLE CHARLES EARL CORNWALLIS, KNIGHT OF THE MOST NOBle order oF THE GARTER; ONE OF HIS BRITANNICK MAJESTY'S MOST HONOURA, BLE PRIVY COUNCIL; LIEUTENANT GENERAL OF HIS MAJESTY'S FORCES; GOVERNOR GENERAL AND COMMANDER IN CHIEF OF ALL THE POSSESSIONS AND FORCES OF HIS BRITANNICK MAJESTY, AND OF THE HONOURABLE THE UNITED COMPANY OF MERCHANTS OF ENGLAND, IN THE EAST INDIES, &c, &c. &c. MY LORD, HE following Compendium of Mercantile Arith THE metick, entirely adapted in its calculations for the ufe of ftudents of that fcience in this country, I beg leave, with all due deference, to entreat your Lordship's protection of; humbly requesting, that it may receive the fanction of your aufpicious patronage, and trufting from your known candour in encouraging every useful improvement, that your Lordship will confider my attempts as the effects of an earneft inclination to become further useful to the youths, whom I had the happiness to be in charge of, and to the publick in general; who, from their continual encouragement, have bound me in grateful fervices to them. Until fome able arithmetician fhall ftep forward, and enlarge upon this field of improvement, I prefume this Work will be particularly useful to the conductors of the Orphan School, an inftitution which redounds to the highest honour of its founders; and proves, in the greateft degree, the noble characteristick of liberality, which, |