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BY ELIAS LOOMIS, L L.D.,

PROFESSOR OF MATHEMATICS AND NATURAL PHILOSOPHY IN THE UNIVERSITY
OF THE CITY OF NEW YORK, AUTHOR OF A COURSE OF MATHEMATIOS,"
"RECENT PROGRESS OF ASTRONOMY," ETC., ETC.

SIXTH EDITION.

NEW YORK:

HARPER & BROTHERS, PUBLISHERS,

329 & 331 PEARL STREET,

FRANKLIN SQUARE.

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