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CONTAINING TIIf y.

RINCIPAL PRO

IN ThE

POSITION^

FIRST SIX, AND THE ELEVENTH AND
TWELFTH BOOKS

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WITh nOTES cRITICal and EXPlanaTORY,

By JOHN BONNYCASTLE,

Of THE ROYAl MIlITARY ACADEMY, WOOlWICH.

THE THIRD EDITION.

LONDON:

PRINTED fOR J. JOhNSON, NO.72, ST. PAUl'S
CHURCh-YARD,

»Y BYE AND lAW, »T. John's-squakh, clERKF.NWSLL.

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PREFACE. . *

*

j

OF all the works of antiquity which have' been transmitted to the present times, none are more universally and deservedly esteemed' than the Elements of Geometry which go under the name of Euclid. In many other branches of science the moderns have far surpassed their masters; but, after a lapse of more than two thousand years, this per-» formance still maintains its original preeminence, and has even acquired additional* celebrity from the fruitless attempts which have been made to establish a different system.

It is, however, generally allbwed, that the Elements, as they now stand, are attended with many difficulties, which greatly retard the progress of learners, on their sirst entrance upon this study, and prevent them from applying to other branches of knowledge, which, in the present advanced state of the sciences, are equally useful and important. Among other obstacles of this kind A 2 may

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