WOOD, De Volson, engineer, born in Smyrna, New York, 1 June, 1832. I le was graduated at the Rensselaer polytechnic institute in 1857 with the degree of C. E., and at once became assistant professor of civil engineering at the University of Michigan, where he was made full professor two years later. In 1872 he was chosen professor of mathematics and mechanics in the Stevens institute of technology, Hoboken, and in 1885 he was transferred to the chair of engineering, which he still retains. Professor Wood designed an ore-dock at Marquette, Michigan, in 1866, and has invented a rock-drill, a steam-pump, and an air-compressor. In 1881 he was chosen president of the board of education in Boonton, New Jersey The honorary degree or A. M. was conferred on him by Hamilton in 1859, and that of M. S. by the University of Michigan in the same year. Professor Wood is a member of the American society of civil engineers and of the American association for the advancement of science, and corresponding member of the American society of architects. He has contributed to mathematical and engineering journals and has published "Treatise on the Resistance of Materials " (New York, 1871); "A Treatise on the Theory of the Construction of Bridges and Roofs" (1872); "The Elements of Analytical Mechanics" (1876) ; "Principles of Elementary Mechanics" (1878) ; "The Elements of Co-ordinate Geometry" (1879) ; "The Mechanics of Fluids" (1884) ; "Trigonometry, Analytical, Plane, and Spherical" (1885); and "Thermodynamics" (1887).