Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

Excerpt from The Elements of Plane and Solid Analytic Geometry Polar coordinates and their relations to rectangular coordinates have been introduced at the very beginning. The conic section is first brie y studied geometrically. Its defining property is proved in this way, from which its general equation is shown to be of the second degree. The two central conics are treated simultaneously by using the double Sign in the standard equation. In this way much time is saved, and the similarities of the properties of the two conics are presented in a striking manner. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."