Math 388,61 Frans, erred from The Lawrence Scientific School, 9 February, '088. Cambridge: PRINTED BY C. J. CLAY, M. A. 8764 PREFACE. THE object of this work is, not to furnish to Wrigley's Collection a Key in which every Example and Problem is worked out and solved, but to exemplify Mathematical Operations and Methods of Solution by numerous illustrations. A Key, it is judged inexpedient to publish, on the ground that it would destroy or impair the value of the Collection as an Exercise book. But a work, in which principles are illustrated and processes set forth, such as would serve to solve every question in the Collection, will, it is anticipated, prove convenient for the Tutor and especially useful for the Student. The Arithmetic and the beginning of the Algebra in the Collection are left untouched. Any list of Errata, sent to the Publishers, would be gratefully received. September 21, 1861. |