BY WHICH THEON, OR OTHERS, HAVE LONG AGO VITIATED THESE BOOKS, ARE COR-

RECTED, AND SOME OF EUCLID'S DEMONSTRATIONS ARE RESTORED.

AL80;.

THE BOOK OF EUCLID'S DATA,

IN; LIKE MANNER CORRECTED.

BY ROBERT SIMSON, M. D.
Emeritus Professor of Mathematics in the University of Glasgow.

TO THIS EDITION ARE ALSO ANNEXED,

ELEMENTS OF PLANE AND SPHERICAL TRIGONOMETRY.

PHILADELPHIA:

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AND

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