In this book the author has presented the elements of Coordinate Geometry in a manner suitable for beginners and junior students. Cartesian and Polar Coordinates only are used, and the book forms Part I of the complete work. Part II deals with Trilinear Coordinates, Projection, Reciprocation, etc. The Straight Line and Circle have been treated more fully than the other portions of the subject, since it is generally in the elementary conceptions that beginners find great difficulties. There are a large number of Examples, over 1100 in all, and they are, in general, of an elementary character. The examples are especially numerous in the earlier part of the book