Water Supply--Water Cocks--Bibb-cocks--Self-closing Bibbs--Lever-handle Bibbs--Fuller Cocks--Wash-tray Bibbs--Basin Cocks--Pantry Cocks--Sill Cocks--Valves--Kitchen and Laundry Fixtures--The Bathroom--Bath Tubs--Wash Stands and Lavatories--Traps--Back-venting--Soil Pipe--Water Closets--Washout Closets--Washdown Closets--Siphon-jet Closet--Flush Tanks--Low-down Flush Tank--Opening Stopped Pipes--Sewer Gas--Range Boilers--The Water-back--Excessive Pressure--Blow-off Cock--Location of Range Boiler--Double Heater Connections--Horizontal Range Boilers--Tank Heaters--Overheater Water--Furnace Hot-water Heaters--Instantaneous Heaters. CHAPTER VII WATER SUPPLY 125 Water Analysis--Pokegama Water--River Water--Artesian Water--Medical Water--Organic Matter--Ammonia--Hardness in Water--Iron in Water--Water Softening With Hydrated Silicates--Chlorine--Polluted Water--Pollution of Wells--Safe Distance in the Location of Wells--Surface Pollution of Wells--Water Table--The Divining Rod--Selection of a Type of Well--Flowing Wells--Construction of Wells--Dug Wells--Open Wells--The Ideal Well--Coverings of Concrete--Artesian Wells--Driven Wells--Bored Wells--Cleaning Wells--Gases in Wells--Peculiarities of Wells--Breathing Well--Freezing Wells--Pumps--The Lift Pump--The Force Pump--Tank Pump--Well Pumps--Wooden Pump--Pumps for Driven Wells--Deep-well Pumps--Tubular Well Cylinders--Chain Pumps--Rain Water Cisterns--Filters--The Hydraulic Ram--Single-acting Hydraulic Ram--The Double-acting Hydraulic Ram--Domestic Water-supply Plants--Gravity Water Supply--Pressure-tank System of Water Supply--The Pressure Tank--Power Water-supply Plants--Electric Power Water Supply--The Water Lift. CHAPTER VIII SEWAGE DISPOSAL 168 The Septic Tank--The Septic Tank With a Sand-bed Filter--The Septic Tank and Anaerobic Filter--Limit of Efficiency. CHAPTER IX COAL 182 Oxidation of Hydrocarbons--Graphitic Anthracite--Cannel Coal--Lignite--Peat--Wood--Charcoal--Coke--Gas-coke--Briquettes --Comparative Value of Coal to Other Fuels--Price of Coal. CHAPTER X ATMOSPHERIC HUMIDITY 196 Humidity of the Air--Relative Humidity--The Hygrometer--The Hygrodeik--Dial Hygrometers--The Swiss Cottage “Barometer”--Dew-point--To Determine the Dew-point--Frost Prediction--Prevention of Frost--Humidifying Apparatus. CHAPTER XI VENTILATION 219 Quantity of Air Discharged by a Flue--Cost of Ventilation--The Wolpert Air Tester--Pneumatic Temperature Regulation--Mechanical Ventilation--The Plenum Method--Ventilation Apparatus--Air Conditioning--Humidifying Plants--Vaporization as a Cooling Agent--Air-cooling Plants--Humidity Control.