PRACTICAL AND THEORETICAL SYSTEM

OF

ARITHMETIC,

CONTAINING A

NEW SYSTEM OF PROPORTION;

WITH

THEORETICAL EXPLANATIONS OF ALL THE PRINCIPAL RULES.

BY GEORGE WILLSON.

FIFTH EDITION, REVISED AND CORRECTED.

CANANDAIGUA.

PUBLISHED AND SOLD, WHOLESALE AND RETAIL, BY

C. MORSE.

BOLD ALSO BY F. J. HUNTINGTON & Co., NEW YORK ; OLIVER
STEKLE, ALBANY; BENNET & BRIGHT, UTICA; AND BY

SIDNEY L. ROOD & CO., DETROIT.

1

ENTERED, according to the Act of Congress, in the year 1838, by
GEORGE WILLSON, in the Clerk's omce of the District Court of the
District of Michigan.