THE

Not in Kis
11-17

NORMAL

UNION ARITHMETIC

GRADED COURSE.

PART III.

BY

EDWARD BROOKS, A. M., Pн. D.,

SUPERINTENDENT OF PUBLIC SCHOOLS OF PHILADELPHIA,

PRINCIPAL AND PROFESSOR OF MATHEMATICS IN PENNSYLVANIA STATE NORMAL
SCHOOL, AND UTHOR OF "THE NORMAL SERIES OF ARITHMETICS," "NORMAL
ELEMENTARY ALGEBRA," "NORMAL GEOMETRY AND TRIGONOMETRY,"
"PHILOSOPHY OF ARITHMETIC," ETC.

'Analysis and Synthesis;-the magic wand whose touch unfolds the mysterious and
beautiful relations of numbers."

PHILADELPHIA:

CHRISTOPHER SOWER COMPANY.

614 ARCH STREET.

W