482 



INDEX 



Silk, 204 



Silver chloride, 166, 195 



Silver-plating, 143 



Skeleton, 342 



Skin, 388, 391, 410 



Skull, 342 



Sky colors, 162 



Slaked lime, 118 



Slate, 262 



Slugs, 320 



Smallpox, 444 



Smell, 409, 412 



Smoke, 213 



Snakes, 328 



Snow, 91, 240 



Soap, 79, 197, 198, 200 



Soda, caustic, 103 



washing, 191 



baking, 191 



water, 118 

 Sodium, 103 



carbonate, 198 



chloride; salt, 191, 194 



hydroxide, 103, 192 



in soil, 275 



nitrite, 54 



salts, tests for, 195 

 Soil, 258, 267, 269, 270 

 Solar plexus, 401 

 Solids, 65 

 Solubility, 89 

 Solute, 87 

 Solutions, 87, 88 

 Solvent, 87 

 Soot, 112 

 Sound, 167, 168 



reflection of, 156 



refraction of, 159 



velocity of, 151 

 Sources of heat, 72 

 Space, 4, 5, 6 

 Specific heat, 70 

 Specific gravity, 31, 32 

 Spectrum, solar, 161 

 Speech, 386 

 Spinal cord, 399 

 Sponges, 315 

 Spore, 302 

 Sprain, 346 



Stains, removal of, 204 

 Stalactites, 122 

 Stalagmites, 122 

 Stamens, 298 

 Starch, 116, 287,349 

 Starfishes, 316 



Stars, apparent position, 158 

 Steam, 85 



engine, 23 



heating, 214, 215 

 Steapsin, 360, 361 

 Stearic acid, 361 

 Stems, 289, 290 

 Sternum, 343 

 Stigma, 298 

 Stipules, 285 

 Stomach, 355 

 Stomata, 286 

 Stoneware, 260 

 Stoves, 210 



electric, 214 



gas, 213 



gasoline and kerosene, 213 

 Stratified rocks, 261, 262 

 Stratum, 261 

 Style, 298 

 Submarine boat, 44 

 Subsoil, 269 

 Substances, 5 

 Sugar refining, 87 

 Sugars, 116, 349 

 Sulphates, 194, 195 

 Sulphur, 5, 51, 106, 210 



dioxide, 51, 106, 454 

 Sulphuric acid, 95, 189 

 Sulphur in soil, 275 

 Sun, 72 



distance of, 9 

 Sunlight, 57 



Suspended substances, 81 

 Switch, electric, 228 

 Sympathetic (nervous) system, 395, 

 400 



Talus, 264 

 Tap root, 295 

 Tarsals, 344 

 Tartaric acid, 189 

 Taste, 409, 411 



