INDEX 



445 



Saturn, 2, 5 



Scale, insects, 365 



Scarlet fever, 427 



Scheele, Carl W., 81 



Science, 246 



Sclerotic coat, 236 



Scorpius, 10 



Screw, 53, 62 



Seasons, 23 



Sedimentary rock, 281 



Seeds, 319, 340 



Separator, 43 



Sewage, disposal of, 420 



Shadows, 222 



Sight, 235 



Silt, 308 



Silver, 254 



Silver nitrate, 276 



Siphon, 79 



Sirius, 11 



Smallpox, 428 



Smut, 348 



Snow, 178 



Soaps, 270, 275 



Sodium, 253 



Sodium hydroxide, 274 



Soil, 280, 288, 341- 



formation of, 284 



composition of, 286 



particles, 288 



conservation of, 291 

 Soil water, 310 

 Solar system, 2 

 Solids, 26 

 Solutions, 101, 102 

 Sori, 332 

 Sound, 212, 214, 216 



reflection of, 214 



voice and hearing, 216 

 Specific gravity, 35 

 Specific heat, 138 

 Spectacles, 228 

 Spectrum, solar, 231, 233 

 Sperm cell, 319 

 Spirogyra, 329 

 Spores, 330, 343, 345 

 Spraying, 344-348, 365-369, appendix 

 Starch, 328 



in foods, 390 

 Stars, 2, 6, 8, 9 

 Steam, 41, 44, 70, 100 

 Steel, 252 

 Stems, 323, 324 



as food, 340 



Stoves, 266 

 Stratus clouds, 177 

 Street cleaning, 418 

 Submarines, 117 

 Substances, 26 

 Sucrose, 393 

 Sugar, 328, 390, 393 

 Sulphates, 276 

 Sulphur, 256 

 Sulphuric acid, 273, 274 

 Sun, 13, 14, 127, 221 

 Suspension, 102 

 Suspensory ligament, 238 



Tartaric acid, 273 



Taurus, 10 



Tea, 395 



Telegraph, 206 



Telephone, 207 



Telescope, 229 



Temperature, 126 

 measurement of, 128 

 of atmosphere, 156 

 relation to sound, 213 



Thermograph, 158 



Thermometer, 128 



Thermos bottle, 143 



Thermostat, 149 



Thunderstorms, 180 



Time, 21 



Time belts, 22 



Tinctures, 102 



Tissues, 316 



Toadstools, 330 



Tobacco, 398 



Tone, 214 



Tools, development, 374 



Tornadoes, 166 



Torricelli, 76 7 . 



Toxins, 410 



Trachea, 89 



Trade winds, 164 



Trees, 335 



value of, 335-336 

 uses of, 337, 339 



Tuberculosis, 425 



Turbines, water, 68 

 steam, 71 



Tympanic membrane, 217 



Typhoid fever, 422 



Umbra, 222 

 Universe, 1 

 Uranus, 2, 3 



