HENRY N. OGDEN, C.E.
Reading edition
PROFESSOR OF SANITARY ENGINEERING IN COLLEGE OF CIVIL ENGINEERING, CORNELL UNIVERSITY SPECIAL ASSISTANT ENGINEER, NEW YORK STATE DEPARTMENT OF HEALTH
New York THE MACMILLAN COMPANY 1911 All rights reserved Copyright, 1911, By THE MACMILLAN COMPANY. Set up and electrotyped. Published January, 1911. Norwood Press J. S. Cushing Co.—Berwick & Smith Co. Norwood, Mass., U.S.A.