604 



INDEX 



Lard, 368; compound, 368; sub- 

 stitutes, 368. 



Leaching, cesspool, 509; of soil, 

 410. 



Length of day, 284-286; effect of, 

 287. 



Levulose, 349. 



Lift pump, 477. 



Light, 54; direct and diffused, 55; 

 diffused natural, 56; diffused 

 artificial, 61; indirect, 63; proper 

 amount, 65; distribution of, 66; 

 cost of, 68. 



Lightning, 241; heat lightning, 242. 



Lows, 251, 263, 266-264; move- 

 ment of a low, 255; winds about 

 a low, 258; elliptical, 260; changes 

 caused by, 264; the paths of, 267; 

 unusual paths of, 268-272; rela- 

 tion to general circulation, 272. 



Lubricating oil, 26; effect on fric- 

 tion, 545; use in Watt's engine, 

 570. 



Machines, 542 ; of the early colo- 

 nists, 518; knowledge of, 520; 

 this, an age of, 521; sewing, 521; 

 horsepower of, 541; mechanical 

 advantage of, 543; simple and 

 compound, 454; law of, 546; 

 efficiency of, 546. 



Malaria, 445. 



Maltos, 349, 373. 



Mantle, for gasoline lamp, 35; for 

 gas lamp, 68; diffused light 

 from, 62. 



Manufactured ice, 164; purity of, 

 169; cost of, 169. 



Mass, 535; units of, 536;* how 

 determined, 537; pound of, 539; 

 kilogram of, 539. 



Measles, 447. 



Measuring, of rain, 194, 220; of 

 snow, 195; of temperature, 12, 

 196, 197; of moisture, 219; of 

 efficiency of machines, 546; of 

 gas, 44; of water, 497. 



Meat foods, 366; deterioration of, 

 366; preserving of, 367; inspec- 

 tion of, 368. 



Mechanical advantage, 543; kinds 

 of, 543; numerical expression of, 

 544. 



Mechanical stokers, 99. 



Mesophytes, 466. 



Metabolism, 317; effect of external 

 temperature upon, 318. 



Meter, water, 495; gas, 43; con- 

 struction of water meter, 496; 

 reading of water meter, 497. 



Microorganisms, 380-449; effect on 

 foods, 154, 380; effect on sewage, 

 510-517. 



Mildew, 388. 



Milk, 359; determination of fat in, 

 360. 



Mixer, of gasoline lamp, 34; of 

 gasoline gas machine, 39. 



Molds, 384-389; effect on foods, 

 388; foods of, 385; kinds of, 387; 

 spores of, 386. 



Monsoons, 278. 



Motor spirit, or motor oil, 40. 



Motors, 650; mechanical, 556; 

 animal, 550; horse and steam 

 contrasted, 553; cost of operat- 

 ing different, 555; water, 557; 

 steam, 565; gas, 574; energy 

 losses in, 581. 



Mucor, 386. 



Mumps, 447. 



Mycelium, 385. 



Naphtha, 25. 



Natural gas, 23; manufacture, into 



gasoline, 40. 

 Neutral, 364. 

 Neutralizer, 374. 



Newcomen's air-steam engine, 567. 

 Nitrifying bacteria, 404. 

 Nitrogen, of the soil, 403; fixing 



bacteria, 405; effect of cropping 



on, 407. 

 Nodule bacteria, 405. 



Oil, kerosene, 5; whale, 5; illumi- 

 nating, 26; inspection of, 28; 

 cotton seed, 368; lubricating, 

 effect on friction, 545; flashing 

 and burning points of, 4, 29. 



Oleo oil, 364. 



Oleomargarine, 363; tax on, 365; 

 test of, 365. 



Open-air living and sleeping, 308. 



Oscillating hook sewing machine, 

 525. 



Oscillating shuttle sewing ma- 

 chine, 525. 



