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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.