INDEX 



605 



Oven, brick, 72, 146. 



Overshot water wheel, 557. 



Oxidation, slow, 345; and tempera- 

 ture, 84; and concentration, 84. 



Oxygen, 81; preparation and pro- 

 perties, 81; concentration of, 84. 



Paraffin, 26; flashing point of, 4; 

 burning point of, 4. 



Parasites, 381, 421. 



Pasteur, Louis, 398. 



Pasteurization, '419. 



Pathogenic, 424. 



Penicillium, 387. 



Petroleum, 22, products of, 23-24; 

 distillation of, 23; our supply of, 

 41; production and fields of, 42. 



Plant life, determined by climate, 

 289; determined by moisture, 

 465. 



Plant relationships, 382. 



Plants, how they absorb moisture, 

 466. 



Plenum system, 333. 



Plumbing, 498; development of, 

 498; importance of, 502; sani- 

 tary fixtures, 592. 



Pneumatic tank, 478. 



Pneumonia, 438. 



Pound, standard, 536; of mass, 

 539; of force, 539; foot-pound, 

 540. 



Power, 641; house on farm, 520, 

 534; transmission of, 564; source 

 of in a machine, 550. 



Power house, on farm, 520, 534; 

 Keokuk water, 559. 



Precipitation, rainfall map, 289; 

 rain, 234; measurement of, 194, 

 195, 220. 



Pressure, of the blood, 182; rela- 

 tion to temperature of water, 

 135; gauge, 136, 495; reduction 

 of in steam heating, 140; how 

 maintained on water system, 

 489; and head of water, 491; in 

 steam boiler, 566; of air, 181, 

 185; area of and wind direction, 

 252; areas control weather, 267; 

 a cause of earth's breathing, 463. 



Producer gas, 104 ; composition of, 

 195. 



Proteins, 349; how much required, 

 351 ; tests for, 350; weighing, 351. 



Psychrometer, 216. 

 Public health, 448. 

 Pump, suction, 476; lift, 477; force, 



477; centrifugal, 484. 

 Pure air, amount required, 311, 



313. 



Putrefaction, 394. 

 Pyroligneous acid, 90. 



Rabies, 446. 



Radiant heat, 121. 



Radiation, 121; laws of, 121; indi- 

 rect system of, 330; direct sys- 

 tem of, 330; direct-indirect sys- 

 tem of, 331; and night cooling, 

 207; and frost, 207. 



Rain, measurement of, 194; drops, 

 size of, 234; and the passing low, 

 264. 



Rainfall, map, 289; annual 

 amount, 456; calculation from 

 moisture in the air, 220. 



Range, coal, 140; gas, 151. 



Rear-icing refrigerator, 161. 



Reflector, 146, 147; for controlling 

 and distributing light, 66. 



Refrigeration, and its uses, 154; 

 and transportation, 174. 



Refrigerator, 154; uses of, 154; 

 styles of, 155, 162; mechanical, 

 162. 



Registers and risers, placing of 

 124. 



Relative humidity, 168; seasonal 

 changes in, 293; daily changes 

 in, 295; determination of, 216, 

 325; Table of, 218. 



Rennet, 365. 



Roman, lamps, 2; hyjjocaust, 112; 

 plumbing, 498. 



Rotary hook sewing machine, 525. 



Rotting, 412. 



Run-off, annual, 457. 



Safety valve, 136; ball and lever, 



137; pop, 137. 

 Saprophytes, 381, 382. 

 Saturated solution, 168. 

 Saturation, 158. 

 Scales, thermometer, 18; beam 



balances, 537; spring balances, 



538. 



Scarlet fever, 447. 

 Screenings, 370. 



