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

i

THE BOOK OF
E U CL I D'S

L DA TAC

TAE

In like manner corrected.

B Y

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

M.DCC.LXXV.