QUADRATURE OF THE CIRCLE AND THE TO WHICH ARE ADDED, ELEMENTS OF PLANE and spheERICAL, BY JOHN PLAYFAIR, F. R. S. LOND. & EDIN. LATE PROFESSOR OF NATURAL PHILOSOPHY, (FORMERLY OF MATHEMATICS), SIXTH EDITION, ENLARGED. EDINBURGH: PRINTED FOR BELL & BRADFUTE; AND STIRLING & SLADE LONDON. |