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THE FIRST SIX BOOKS OF EUCLID
QUADRATURE OF THE CIRCLE AND THE
GEOMETRY OF SOLIDS;
TO WHICH ARE ADDED
ELEMENTS OF PLANE AND SPHERICAL TRIGONOMETRY.
JOHN PLAYFAIR, F. R. S. Lond. & EDIN.
PROFESSOR OF NATURAL PHILOSOPHY, FORMERLY OF MATHEMATICS,
IN THE UNIVERSITY OF EDINBURGH.
FROM THE LAST LONDON EDITION, ENLARGED.
PUBLISHED BY E. DUYCKINCK, AND GEORGE LONG,
G. Loog, Printer, No. 71, Pearl-Street.
It is a remarkable fact in the bistory of science, that
a the oldest book of Elementary Geometry is still considered as the best, and that the writings of EUCLID, at the distance of two thousand years, continue to form the most approved introduction to the mathema. tical sciences. This remarkable distinction the Greek Geometer owes not only to the elegance and correctness of his demonstrations, but to an arrangement most happily contrived for the purpose of instruction, -advantages which, when they reach a certain eminence, secure the works of an author against the injuries of time, more effectually than even originality of invention. The elements of Euclid, however, in passing through the hands of the ancient editors, during the decline of science, had suffered some diminution of their excellence, and much skill and learning have been employed by the modern mathematicians to deliver them from blemishes, which certainly did not enter into their original composition. Of these