OF

G E O M E TRY

AND

CONIC SECTION S.

BY ELIAS LOOMIS, LL.D.,

PROFESSOR OF MATHEMATICS AND NATURAL PHILOSOPHY IN THE UNIVERSITY OF THE CITY

OF NEW YORK, AND AUTHOR OF A “COURSE OF MATHEMATICS."

NINTH EDITION.

NEW YORK:

HARPER & BROTHERS, PUBLISHERS,

Entered, according to Act of Congress, in the year 1847, by

ELIAS LOOMIS,

In the Clerk's Office of the Southern District of New York. TO THE

HON THEODORE FRELINGHUYSEN, LLD,

CHANCELLOR OF THE UNIVERSITY OF THE CITY OF NEW YORK,