TIE

ELEMENTS OF EUCLID,

VIZ

THE FIRST SIX BOOKS,

Together with the

ELEVENTH AND TWELFTH.

THE ERRORS,

By which Thèon, or others, have long ago vitiated these Books, are corrected, and some of

Luclid's demonstrations are restored.

ALSO,

THE BOOK OF EUCLID'S DATA,

IN LIKE MANNER CORRECTED.

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

TO THIS EDITION ARE ALSO ANNEXED,
ELEMENTS OF PLANE AND SPHERICAL TRIGONOMETRY.

PHILADELPHIA:

PUBLISHED BY JOHNSON AND WARNER,
AND SOLD AT THEIR BOOKSTORES IN PHILADELPHIA, RICIIMOND, (Vir.)

AND LEXINGTON, (Kea.)

...•.••.•.