ARITHMETICAL SERIES.

BY GEO. R. PERKINS, LL. D

PRIMARY ARITHMETIC.

18mo. 160 pages. Price 21 Cents.

This work is in two parts. 1st, Intellectual Arithmetic, and 2d, Primary Written Arithmetic. It will be found to contain

A familiar treatment of the ground rules, and an informal and extended explanation of the principles of Decimals, in connection with exercises in Federal Money.

ELEMENTARY ARITHMETIC. 16mo. 350 pages. Price 42 Cents. This work is peculiarly adapted to discipline the minds of those who study it.

No principle is left unelucidated, and new light is thrown upon many heretofore imperfectly illustrated.

The subject of Proportion and Ratio is presented with peculiar force; as also, in Equation of Payments, the method of finding the Cash Balance.

The method of Extraction of the Cube Root is greatly preferable to the old method. It is far more concise and more comprehensive; saving nearly half the labor, and being applicable, with little variation, to the extraction of all arithmetical roots.

PRACTICAL ARITHMETIC.

62 Cents.

12mo. Cloth sides. 354 pages. Price

The Practical Arithmetic, containing about 4000 examples, is sub· stantially the same as the Elementary," and is designed for the use of such institutions and schools as require more examples than are given in that work. The almost universal expression of those who have used it is, that "it is the best and most complete arithmetic published."

KEY TO THE PRACTICAL ARITHMETIC. 12mo. Cloth sides. 324 pages. Price 75 Cents.

This work, which is just published, contains complete and fa. solutions to nearly 4000 examples, and is designed for the use of teachers only.

HIGHER ARITHMETIC. 12mo. Sheep. Price 75 Cents.

This work is what its name purports, and develops Arithmetical principles higher than are usually found in other school Arithmetics and fully explains the science of numbers and their application.

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