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PREFACE.

It is one object of the present Work to abridge the labour of teaching and learning Arithmetic, by rendering the Rules as simple, and the explanations as intelligible, as possible.

To effect this, several Rules, as those for Interest, Gain and Loss, Exchange, &c., are briefly adverted to, or omitted, because they are but varied applications of the RULE OF THREE; and because, in Counting Houses, Tables INTEREST AND Exchange always consulted.

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Some other Rules, as those for Permutations, Combinations, &c., are likewise omitted, because answers can be much more readily obtained by Algebra.

The Rules for the use of Logarithms are added, as affording a clearer method of extracting the Cube, or any higher, Root, than the ordinary arithmetical one.

It is a second object, to provide the most useful Rules only, previous to the commencement of Algebra ; for this is now very generally taught, and is a subject, of which no boy ought to be permitted to remain ignorant.

R. F. CLARKE.

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