P Philadelphia and chlorination, 136 Pipe corrosion, 69 Pittsburg report, 71 Plumbo solvency, 71 _P. mirabilis_, 31 Potassium permanganate, 23 Puerperal fever in Vienna, 4 Pumps, for admixture, 41 R Red Bank, sewage disinfection at, 7 Reversed ratio of counts, 54 S Sewage disinfection at Baltimore, Berlin, 7 Boston, 7 Brewster, 6 Hamburg, 6 Maidenhead, 6 Sludge, as cause of complaints, 65 Sodium bisulphite, 86 Sodium chloride, deposits, 1 decomposition of, 106 Sodium hypochlorite, 105 decomposition of, 26 effect of ammonia on, 21 hydrolysis of, 26 Sodium thiosulphate, 87 Standard of purity, 30 Storage tanks, 75 Sulphuretted hydrogen, 33 Sylvine, 1 T Tannin, 67 Tastes, effect of contact period on nature of, 63 Temperature, effect on absorption of chlorine, 35, 38 bleach deterioration, 72 dosage, 34, 36 germicidal velocity, 38 pressure of liquid chlorine, 96 tastes and odours, 66 Thermophylic organisms, 54 Tolidine, 82 Toxic action of chlorine, 22, 29 Turbidity, effect on dosage, 45 effect of chlorine on, 132 U Use of chlorination, 144 W Water mains, disinfection of, 8 Well water, 7 Worcester, chlorination at, 11 Worthing experiments, 5 Subjects Related to this Volume For convenience a list of the Wiley Special Subject Catalogues, envelope size, has been printed. These are arranged in groups--each catalogue having a key symbol. (See Special Subject List Below.) To obtain any of these catalogues, send a postal using the key symbols of the Catalogues desired. _List of Wiley Special Subject Catalogues_ =1--Agriculture. Animal Husbandry. Dairying. Industrial Canning and Preserving.= =2--Architecture. Building. Masonry.= =3--Business Administration and Management. Law. Industrial Processes:= Canning and Preserving; Oil and Gas Production; Paint; Printing; Sugar Manufacture; Textile. CHEMISTRY =4A= General; Analytical, Qualitative and Quantitative; Inorganic; Organic. =4B= Electro- and Physical; Food and Water; Industrial; Medical and Pharmaceutical; Sugar. CIVIL ENGINEERING =5A= Unclassified and Structural Engineering. =5B= Materials and Mechanics of Construction, including: Cement and Concrete; Excavation and Earthwork; Foundations; Masonry. =5C= Railroads; Surveying. =5D= Dams; Hydraulic Engineering; Pumping and Hydraulics; Irrigation Engineering; River and Harbor Engineering; Water Supply. (Over) =5E= Highways; Municipal Engineering; Sanitary Engineering; Water Supply. Forestry. Horticulture, Botany and Landscape Gardening. =6=--Design. Decoration. Drawing: General; Descriptive Geometry; Kinematics; Mechanical. ELECTRICAL ENGINEERING--PHYSICS