PRACTICAL ARITHMETIC.

THE

PRACTICAL ARITHMETIC,

WITH

NOTES AND DEMONSTRATIONS

TO THE

PRINCIPAL RULES,

IN WHICH THE

PRINCIPLES AND PRACTICE OF THAT SCIENCE
ARE RENDERED FAMILIAR,

AND PRACTICALLY ADAPTED TO THE USE OF
PRIVATE AND PUBLIC SCHOOLS.

BY

JOHN DARBY,

TRAFALGAR STREET ACADEMY, LEEDS,

AUTHOR OF THE

STUDENT'S ALGEBRA," AND "A KEY TO THE ALGEBRAICAL
PROBLEMS OF THE REV. DR. BLAND, LATE FELLOW AND TUTOR
OF ST. JOHN'S COLLEGE, CAMBRIDGE.

LONDON:

WHITTAKER & CO., AVE-MARIA-LANE;

OLIVER AND BOYD, EDINBURGH; H. W. WALKER, LEEDS;
MOZLEY AND SONS, DERBY;

AND MAY BE HAD ON ORDER OF ALL BOOKSELLERS.

MDCCCXLIII.

TO THE

REV. JOSEPH HOLMES D.D.

LATE FELLOW AND TUTOR OF QUEENS' COLLEGE, CAMBRIDGE,

NOW HEAD MASTER OF THE LEEDS FREE GRAMMAR SCHOOL,