A new system of arithmetick, [electronic resource] : theorical and practical. Wherein the science of numbers is demonstrated in a regular course from its First Principles, thro' all the Parts and Branches thereof; Either known to the Ancients, or owing to the Improvements of the Moderns. The Practice and Application to the Affairs of Life and Commerce being also Fully Explained: So as to make the Whole a Complete System of Theory, For the Purposes of Men of Science; And of Practice, for Men of Business. By Alexander Malcolm, A. M. Teacher of the Mathematicks at Aberdeen.