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THE FIEST 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. SEDN.
IN THE UNIVERSITI QF EDIN IYRGY.
FROM THE LAST LONDON EDITION, ENLARGED,
PUBLISHED BY JAMES EASTBURN AND CO.
G. Long, Printer.
: It is a remarkable fact in the history of science, that
the oldest book of Elementary Geometry is still con
sidered as the best, and that the writings of EUCLID, į at the distance of two thousand years, continue to
form the most approved introduction to the mathematical 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