Small 8vo, 3 50 Johnson’s (W. W.) Theory of Errors and the Method of Least Squares 12mo, 1 50 * Johnson’s (W. W.) Theoretical Mechanics 12mo, 3 00 Laplace’s Philosophical Essay on Probabilities. (Truscott and Emory.) 12mo, 2 00 * Ludlow and Bass. Elements of Trigonometry and Logarithmic and Other Tables 8vo, 3 00 Trigonometry and Tables published separately Each, 2 00 * Ludlow’s Logarithmic and Trigonometric Tables 8vo, 1 00 Mathematical Monographs. Edited by Mansfield Merriman and Robert S. Woodward Octavo, each 1 00 No. 1. History of Modern Mathematics, by David Eugene Smith. No. 2. Synthetic Projective Geometry, by George Bruce Halsted. No. 3. Determinants, by Laenas Gifford Weld. No. 4. Hyperbolic Functions, by James McMahon. No. 5. Harmonic Functions, by William E. Byerly. No. 6. Grassmann’s Space Analysis, by Edward W. Hyde. No. 7. Probability and Theory of Errors, by Robert S. Woodward. No. 8. Vector Analysis and Quaternions, by Alexander Macfarlane. No. 9. Differential Equations, by William Woolsey Johnson. No. 10. The Solution of Equations, by Mansfield Merriman. No. 11. Functions of a Complex Variable, by Thomas S. Fiske. Maurer’s Technical Mechanics 8vo, 4 00 Merriman and Woodward’s Higher Mathematics 8vo, 5 00 Merriman’s Method of Least Squares 8vo, 2 00 Rice and Johnson’s Elementary Treatise on the Differential Calculus Sm. 8vo, 3 00 Differential and Integral Calculus. 2 vols. in one Small 8vo, 2 50 Wood’s Elements of Co-ordinate Geometry 8vo, 2 00 Trigonometry: Analytical, Plane, and Spherical 12mo, 1 00 MECHANICAL ENGINEERING. MATERIALS OF ENGINEERING, STEAM-ENGINES AND BOILERS.