INDEX 



359 



Litmus, action of acids, 220. 



action of bases, 221, 222. 



action of neutral substance, 222. 

 Logwood dyes, 245, 247, 248. 

 Los Angeles aqueduct, 211. 

 Lye, 221, 222. 



Machines, compound, 171. 



inclined plane, 162-166. 



lever, 158-162. 



pulley, 166-169. 



wheel and axle, 169-171. 

 Madder, for dyes, 245. 

 Magnet, 328. 



electro-, 319. 



field of, 329-331. 



lines of force about, 329-331. 



poles of, 330-332. 



properties of electricity, 318. 

 Magnetic, needle, 328. 



poles, 3297-331. 



Magnifying power, of a lens, 

 115. 



of a microscope, 115. 



of a telescope, 115. 

 Mammoth Cave of Kentucky, 71. 

 Manganese dioxide, 46. 



chlorine made from, 238. 



oxygen made from, 46. 

 Marble, for carbon dioxide, 55. 

 Matches, 47. 



safety, 47-48. 

 Matching colors, 137. 

 Matter, conservation of, 58, 59. 

 Meat, 66. 



preservation of, 253. 

 Mechanical devices, 154, 155. 

 Melting, 39, 40. 

 Melting point, 40. 

 Melting substances without a definite 



melting point, 40. 

 Mercerized cotton, 218. 

 Mercury, barometer, 84. 



thermometer, 14-17. 

 Metals, electroplating, 317. 



preservation by paint, 253-254. 



veins deposited by precipitation, 

 72, 73. 



welding, 315. 

 Meter, gas, 93, 94. 

 Microorganisms, 132, 133. 

 Microscope, 115. 



Milk, boiling point, 32. 



Pasteurized, 250. 

 Minerals, in foods, 62, 63. 



in water, 70, 71. 

 Mirrors, 108-112. 



distance of image behind mirror, 111. 



distance of object in front of mirror, 

 111. 



image a duplicate of object, 111. 

 Molding of glass, 40. 

 Molecule, 100-103. 

 Mordants, 247, 248, 249. 

 Morphine, 257. 

 Morse, telegraphic code, 324. 

 Motion, in sound, 266, 278, 280. 



in work, 156. 

 Motor, electric, 336. 



principle of, 333. 



street car, 337. 

 Mouth breathing, 50. 



cause of, 51. 



Movable pulley, 167, 168. 

 Music, 278. 

 Musical instruments, percussion, 299. 



stringed, 284-295. 



wind, 295, 299. 

 Musical scale, 282. 



Naphtha in gas engines, 185. 

 Naphthalene, 152. 

 Narcotics, 255. 

 Natural gas, 152. 

 Needle, magnetic, 328. 

 Negative, electrode, 308. 



photographic, 130. 

 Neutral substance, 222. 



and litmus, 222. 

 Neutralization, 222. 

 Niagara Falls, 176. 

 Nitrogen, 66. 



and bacteria, 263. 



and plant life, 261. 



in atmosphere, 261. 



in fertilizer, 262-265. 



in food, 66. 



preparation of, 261. 



properties of, 261. 

 Noise in music, 280. 

 Non-conductors, of electricity, 321- 

 322. 



of heat, 25. 

 Nutcracker, as a lever, 162. 



