THE PRACTICAL ARITHMETIC, WITH NOTES AND DEMONSTRATIONS TO THE PRINCIPAL RULES, IN WHICH THE PRINCIPLES AND PRACTICE OF THAT SCIENCE AND PRACTICALLY ADAPTED TO THE USE OF BY JOHN DARBY, TRAFALGAR STREET ACADEMY, LEEDS, AUTHOR OF THE STUDENT'S ALGEBRA," AND "A KEY TO THE ALGEBRAICAL LONDON: WHITTAKER & CO., AVE-MARIA-LANE; OLIVER AND BOYD, EDINBURGH; H. W. WALKER, LEEDS; AND MAY BE HAD ON ORDER OF ALL BOOKSELLERS. MDCCCXLIII. |