488 



INDEX 



Iron, melting point of, 46 



rust prevention, 54 



rust spots removed, 147 



smelting, 173-174 



stains from Prussian blue, 165 



uses of, 175 



Irrigation, ^^^-^^< > , 353~3S6 

 Isobars, 383 

 Isotherms, 384 



Jellies, adulterated, 98, 101-102 

 coloring matter in, 103 



Kerosene, 123-125, 276 

 Kiln, lime, 421 



Labor-saving devices, 289-310 



Lacquer, 185 



Lamp, 276-277 



Larva, 473, 474, 477 



Latex, 458 



Laundry, bleaching, 161 



blueing, 163-165 



soap, 143-144 



starching, 165-167 



washing powders, 144-146 

 Lava, 411, 414, 417 

 Lead, compounds injurious to body, 178 



in pewter, 179 



occurrence in nature, 173 



uses of, 178 



white, as paint, 183-184 

 Leaf, as food, 448-449 



green or chlorophyll, 269, 441, 442 



shape, 447 



structure, 447 



water vapor from, 443 

 Leather, 137 

 Leaven, 154 

 Lenses, in photography, 257-258 



of eye, 258-259 



refraction of, 255-256 



uses of, 253, 254, 257-258 



varieties, 256-257 

 Lever, 293-295 



Lift pump, 321-323 



Light, and disease, 199-200, 267-268 



and eyestrain, 247-251 



and heat, 269-270 



and plants, 268-269, 44 1 



artificial, 275-280 



chemical action of, 262 



effect of distant, 241 



electric, 213, 280 



path of, 242 



photography, 263-267 



reflection of, 243-247, 273 



refraction of, 252-258 

 Lime, 66, 181, 421 

 Limestone, 418, 421 

 Lime water, 149, 181 

 Linen, 132-136 



how prepared, 456-457 

 Linseed oil, 183, 184 

 Liquid soap, 143 

 Litmus, 140-141 

 Logwood, 169, 170 

 Lumber, 454-456 

 Lye, 143 



Machines, 289-310 

 Madder, 168 

 Maggots, 473 

 Magnets, 225-233 



electricity as, 217-219, 228, 230 



extent of field, 226 



poles of, 226-228 



produce electric current, 234-236 

 Malaria, 474 

 Mammals, 463 

 Mandolin, 284 

 Manganese dioxide, 50, 51 

 Manure, 190 

 Maple sirup, 459 

 Marble, building stone, 419-421 



carbon dioxide prepared from, 60 



metamorphic rock, 419-421 

 Mastication, 92 

 Matches, 51-53 

 Matter, conservation of, 65 



