The present elementary text-book embodies the course inS olid Coordinate Geometry which, for several jears, it has been part of ray duties asL ecturer in Mathematics at the University of Glasgow to give to two classes of students. For the student whose interests lie in the direction of Applied Mathematics, the book aims at providing a fairly complete exposition of the properties of the plane, the straight line, and the conicoids. It is also intended to furnish him with a book of reference which he may consult when his reading on Applied Mathematics demands a knowledge, say, of the properties of curves or of geodesies. At the same time it is hoped that the student of Pure Mathematics ma} find here a suitable introduction to the larger treatises on the subject and to works on Differential Geometry and the Theory of Surfaces. Tlie matter has been arranged so that the first ten chapters contain a first course which includes the properties of conicoids as far as coufocals. Certain sections of a less elementary character, and all sections and examples that involve the angleor distance-formuiae for oblique axes have been marked with an asterisk, and may be omitted. Chapter XL has been devoted to the discussion of the General Equation of theS econd Degree. This order of arrangement entails some repetition, but it has compensating advantages. The student who has studied the special forms of the equation finds less difficulty and vagueness in dealing with the general. (Typographical errors above are due to OCR software and don't occur in the book.) About the Publisher Forgotten Books is a publisher of historical writings, such as: Philosophy, Classics, Science, Religion, History, Folklore and Mythology. Forgotten Books' Classic Reprint Series utilizes the latest technology to regenerate facsimiles of historically important writings. Careful attention has been made to accurately preserve the.