• NEW

ELEMENTARY ALGEBRA:

CONTAINING THE

RUDIMENTS OF THE SCIENCE.

FOR

SCHOOLS AND ACADEMIES.

BY

HORATIO N. ROBINSON, LL. D.,

AUTHOR OF A FULL COURSE OF MATHEMATICS.

CHICAGO:

PUBLISHED BY S. C. GRIGGS & CO.,

NEW YORK: IVISON, PHINNEY, BLAKEMAN & CO.

Educ T128.66.750

BY EXCHANGE

JUN 23 1939

ROBINSON'S

Series of Mathematics,

The most COMPLETE, most PRACTICAL, and most SCIENTIFIC SERIES of
MATHEMATICAL TEXT-BOOKS ever issued in this countra,

(IN TWENTY-TWO VOLUMES.)

Robinson's Progressive Table Book,
Robinson's Progressive Primary Arithmetic, -
Robinson's Progressive Intellectual Arithmetic,
Robinson's Rudiments of Written Arithmetic,
Robinson's Progressive Practical Arithmetic,
Robinson's Key to Practical Arithmetic, -
Robinson's Progressive Higher Arithmetic,
Robinson's Key to Higher Arithmetic,

Robinson's Arithmetical Examples,

Robinson's New Elementary Algebra,

Robinson's Key to Elementary Algebra,

Robinson's University Algebra,

Robinson's Key to University Algebra,

Robinson's New University Algebra,

Robinson's Key to New University Algebra,⚫

Robinson's New Geometry and Trigonometry,

Robinson's Surveying and Navigation,

Robinson's Analyt. Geometry and Conic Sections,

Robinson's Differen. and Int. Calculus, (in preparatic 1 )

Robinson's Elementary Astronomy,

Robinson's University Astronomy,

Robinson's Mathematical Operations,

Robinson's Key to Geometry and Trigonometry, Conic
Sections and Analytical Geometry,

Entered, according to Act of Congress, in the year 1859. bv

HORATIO N. ROBINSON, LL.D.,

In the Clerk's Office of the District Court of the United States for the Northern
District of New York.

PREFACE,

WITHIN the last twenty years Algebra has been steadily gaining ground and favor as an important branch of education, and it is now taught and studied in all the academies, seminaries, and best public schools in our country. While this fact is indicative of the onward progress of popular education, it also bears testimony to the value of the science as one eminently calculated to discipline the mind and develop the reasoning powers.

Pupils now commence this study at an earlier age than formerly, and hence the necessity of a work elementary in its character, and adapted to the comprehension of the youthful mind.

In the preparation of the following treatise the author has constantly kept in mind the existing condition of school and academic education, and has adapted the work to the most approved modern methods of teaching.

The author believes this treatise to be superior to other elementary works upon the same subject in the following particulars: beauty of typography, the clear and concise operations and analyses of the rules and principles, the great number of examples and their adaptation to the several subjects, and the progressive character of the work, so necessary to the vigorous development of the intellect.