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The Errors, by which THEON, or others, have long ago
vitiated these Books, are corrected,
And some of EUCLID's Demonstrations are restored.
A L S 0
THE BOOK OF
L DA TAC
In like manner corrected.
ROBERT SIMSON, M. D.
Emeritus Professor of Mathematics in the University of Glasgow.
To this FIFTH EDITION are also annexed,
ELEMENTS of PLAIN and SPHERICAL TRIGONOMETRY,
E DIN BURGH H.
Printed for J. NOURSE, London, and J. BALFOUR, Edinburgh