INDEX 



415 



Sanitation Continued 



plumbing, 147 



Save life, artificial respiration, 71 

 Science, in the garden, 298 



method of, n 



recent progress in, 1 2 



relation to discovery of malaria, 13 



study of, 1 6 



use in daily life, 13, 17 



use in home work, 18 



use in straight thinking, 17 

 Sclerotic, 258 

 Semicircular canals, 377 

 Septic tank, 153, 154 

 Sewage, disposal of, 152 

 Shears, 333 

 Sheep, 226 

 Short circuit, danger, 367 



description of, 366 

 Silk, description of, 229 



relation to heat, 230 

 Siphon, method of working, 149 

 Skin, 220 



bathing of, 222 



section through, 220 

 Smothering, 212 

 Snakes, 330 

 Soap, use of, 233 



washing powders, 234 

 Soil, air in, 301 



composition of, 49, 299 



effect of cultivation, 301, 302 



formation of organic, 50 



harrowed and packed, 302 



inorganic, 302 



nitrogen from, 304 



relation to home, 50 



relation to planting, 49 



water in, 300 

 Solution, meaning of, 86 



soluble, 86 

 Sound, 373 



due to vibration, 373 

 Spectrum, 258 

 Speech, 375 

 Speed, change of, 340 

 Spiracles, 320 



Spontaneous combustion, 211 

 Spots and stains, removal, 235 

 Springs and wells, 77 



relation to underground water, 77 



safe and deadly, 78 



Stamp collecting, 384 

 Stars, 402 



groups of, 404 



Large Dipper, 403 



North Star, 403 



our relation to, 404 



shooting, 405 

 Steam heat, 195 



advantages of, 197 



description of, 196 



disadvantages of, 197 



heat stored in steam, 196 



protection of loss of heat, 197 

 Stone, 270 



artificial, 271 



granite quarry, 270 



life of building, 271 

 Stoves, coal, description of, 190 

 Stringed instruments, 379 

 Sun, position of, 52 

 Sunlight, absorption of, 242 



Teeth, 102, 165 



care of, 165 



decay, 165 



uses of, 102 

 Telephone, 352 

 Temperature, 181 



kindling, 181 



measurement of, 22, 182 



regulation of, 220 



relation to body, 183 

 Tepee, 26 

 Tests, astigmatism, 262 



for farsightedness, 262 



for nearsightedness, 262 

 Textile fibers, 231 

 Thermometer, clinical, 182 



house, 182 

 Thermos bottle, 125 

 Thorax, 319 



related to insect, 319 

 Toxins, 163 

 Tracheae, 323 

 Transformer, 351 

 Translucent, 240 

 Transparent, 239 



transparency, experiment, 240 

 Traps, 152 

 Trees, arrangement of, 288 



relation to home, 289 



use of, 289 



