492 



INDEX 



Soda mint, 152 

 Sodium, 181 



bicarbonate, 61, 152 



carbonate, 145, 150, 152 



chloride. See Salt 



thiosulphate, 264 

 Soft drinks, 194 

 Soil, color of, 391 



fertility of, 365-366 



movements of water through, 3 59-360 



poverty of, 187 



source of food to plants, 438 

 Solenoid, 217 

 Soothing sirup, 194 

 Sound, 281-288 

 Soups, 86-87 

 Spawn, 466-468 

 Spectrum, 271-272 

 Spontaneous combustion, 5657 

 Spores, 1 08, 114 

 Spraying trees, 331 

 Springs, 347-348 



hot, 415-416 



mineral, 3S7~3S8 

 Squash bug, 477-478 

 Stains, from blueing, 165 



removal of, 146-147, 163 

 Stamens, 424 

 Starch, 70-71 



effect of heat upon, 87-88 



effect of pancreatic juice upon, 95 



effect of ptyalin upon, 92, 93 



in the laundry, 165-167 



source of, 167 

 Steam, as working power, 314-315 



engines, 316-317 



heating, 39 

 Steel, 20, 175 

 Stems, as food, 453 



as lumber, 454-456 



as part of plant, 423 



flow of sap through, 451 



growth of, 452-453 



structure of, 450-451 



uses of, 450 



Stigma, 425-427 

 Stimulants, 191-195 

 Stokers, 121 

 Stomach, 93-95 

 Stomata, 443-444 

 Stones, building, 417-422 

 Storage reservoir, 355 

 Stove, 22, 212 



oil, 124, 277 

 Stratified rock, 418 

 Strings, musical, 284-285 

 Style, 425 

 Sucrose, 97 

 Sugar, as food preservative, 112-113 



filtered through charcoal, 62 



glucose, 97-98 



saccharine, 98 

 Sulphites, 116 

 Sulphur, 72, 123 

 Sulphuric acid, in bleaching, 161 



in electric cell, 207 



in fire extinguishers, 61 

 Sulphurous acid, 117, 162-163 

 Summer, 398 

 Sun, 396-398 



Sunlight, action of, 199-200, 267-268 

 Survival of the fittest, 430-432 



Table of Food Values, 78, 80-81 

 Tanning of leather, 137 

 Tapeworm, 89, 90 

 Telegraph, 221-224 

 Telephone, 237-238 

 Temperature, 17-20 



and earth's movements, 396-399 



and heat, 33 



and weather, 42-44 



and wind, 27, 402-403 

 Textiles, 129-136 

 Thermometer, 18-20 

 Thermos bottle. See Vacuum bottle 

 Tin, coating for iron, 176-177 



in bronze and pewter, 179 



melting point of, 46 



occurrence in nature, 173, 176 



