✓

Entered according to act of Congress, in the year 1842,
By OSMAN CALL,

in the Clerk's Office of the District Court of the United States for the Vermont District.

STEREOTYPED AND PRINTED BY MORRILL, SILSBY, & CO. CONCORD, N. H.

PREFACE.

In presenting to the public a new School-Book, it may be proper to state the circumstances which have led to its publication.

The author, Mr. Osman Call, having prepared manuscripts on REDUCTION, REDUCTION OF CURRENCIES, DECIMALS, INTEREST, and SQUARE AND CUBIC MEASURE, in which he had given new rules and new methods of performing arithmetical questions, wished to present his system to the public.

Knowing that a complete system of arithmetic would be required, in order to render his book useful and acceptable to the public, he engaged the subscriber to act as editor in preparing a book for the press, in which his peculiar method should be found. In engaging in this enterprise, we felt our incompetency to do justice to the science of arithmetic. And the farther we proceeded, the more clearly did we see the wide field, which we had not explored, rising to our vision.

But unlike many other subjects, arithmetic cannot lead one far astray, if a close adherence be maintained to the exact course indicated by figures. Hence, we have ventured to depart from the beaten path of arithmeticians, and mark out a new arrangement, new rules, and a new method of operation peculiar to this work.

The subscriber made use of Mr. Call's manuscripts in preparing those articles in which his peculiar method is given. He made such selections from these manuscripts as he thought proper; added such new matter as, in his opinion, would be useful to the