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THE
ELEMENTS
O F
EUCLID.
viz.
THE FIRST SIX BOOKS,
TOGETHER WITH THE
ELEVENTH AND TWELFTH.
In this Edition, the Errors, by which Theon, or others, have long ago Vitiated theſe Books, arc Corrected,
And ſome of Euclid’s Demonſtrations are Reſtored.
B Y
ROBERT SIMSON, M. D.
Profeſſor of Mathematics in the Univerſity of Glaſgow.
GLASGOW,
PRINTED BY ROBERT AND ANDREW FOULIS PRINTERS TO THE UNIVERSITY
M.DCC.LVI.
