HORATIO N. ROBINSON, LL.D., AUTHOR OF A FULL COURSE OF MATHEMATICS. REWRITTEN BY I. F. QUINBY, A.M., LL.D., PROFESSOR OF MATHEMATICS AND NATURAL PHILOSOPHY, UNIVERSITY OF ROCHESTER ; IVISON, BLAKEMAN, TAYLOR & CO. NEW YORK: CHICAGO: Educ T 148.68.750 Edwat 148.70.752 ROBINSON'S Mathematical Series. Graded to the wants of Primary, Intermediate, Grammar, Progressive Table Book. Progressive Primary Arithmetic. Progressive Intellectual Arithmetic. Rudiments of Written Arithmetic. JUNIOR-CLASS ARITHMETIC, Oral and Written. NEW. Progressive Practical Arithmetic. Key to Practical Arithmetic. Progressive Higher Arithmetic. Key to Higher Arithmetic. New Elementary Algebra. Key to New Elementary Algebra. New University Algebra. Key to New University Algebra. New Geometry and Trigonometry. In one vol. Geometry, Plane and Solid. In separate vol. Trigonometry, Plane and Spherical. In separate vol. New Analytical Geometry and Conic Sections. New Surveying and Navigation. New Differential and Integral Calculus. University Astronomy-Descriptive and Physical. Key to Geometry and Trigonometry, Analytical Geometry and Conic Sections, Surveying and Navigation. Entered, according to Act of Congress, in the year 1868, by In the Clerk's Office of the District Court of the United States for the Eastern In the preparation of this work, the author's previous treatise, ELEMENTS OF GEOMETRY, has formed the groundwork of construction. But in adapting the work to the present advanced state of Mathematical education in our best Institutions, it was found necessary so to alter the plan, and the arrangement of subjects, as to make this essentially a new work. The demonstrations of propositions have undergone radical changes, many new propositions have been introduced, and the number of Practical Problems greatly increased, so that the work is now believed to be as full and complete as could be desired in an elementary treatise. In view of the fact that the Seventh Book is so much larger than the others, it may be asked why it is not divided into two. We answer, that classifications and divisions are based upon differences, and that the differences seized upon for this purpose must be determined by the nature of the properties and relations we wish to investigate. There is such a close resemblance between the geometrical properties of the polyedrons and the round bodies, and the demonstrations relating to the former require such slight modifications to become applicable to the latter, that there seems no sufficient reason for separating into two Books that part of Geometry which treats of them. |