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BT WHICH THEOK, OR OTHERS, HAVE LONG AGO VITIATED THESE BOOKS, ARE COR-
RECTED, AND SOME OP EUCLID'S DEMONSTRATIONS ARE RESTORED.

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BY ROBERT SIMSON, M. D.

Emeritus Professor of Mathematics in the University of Glasgow.

TO THIS EDITION ARE ALSO ANNEXED,

ELEMENTS OFPLJUtEAXO SPHERICAL TRIGONOMETRY.
PHILADELPHIA:

PUBLISHED BY

ROBERT DESILVER, No. 110, WALNUT STREET,

AND

THOMAS DESILVER, No. 253, MARKET STREET.

J. Maxwell, Printer.

1821.

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