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THE FIRST SIX BOOKS,
TOGETHER WITH THE
ELEVENTH AND TWELFTH.
The Errors, by which THEON, or others, have long ago
And fome of EUCLID'S Demonstrations are restored.
ROBERT SIMSON, M. D.
Emeritus Profeffor of Mathematics in the University of Glasgow.
To this FIFTH EDITION are also annexed,
ELEMENTS of PLAIN and SPHERICAL TRIGONOMETRY,
Printed for J. NOURSE, London, and J. BALFOUR, Edinburgh,