544 



INDEX 



Convection, questions on, 111 



and ventilation, 110 

 Cooking, carbon dioxide in, 233 



of eggs, 224 



fat in, 223 



of meats, 223 



of vegetables, 223 



use of baking soda, 223 

 Cornea, 357 

 Corona Borealis, 487 

 Cough syrups, 250 

 Crystallization, 446 

 Cycle, 399 

 Cygnus, 487 



Currents, A.C. and D.C., 397, 398 

 Culex mosquito, 294 

 "Cures," deafness, 254, 255 



for hair growing, 253 



obesity, 253 

 Cyclones, 62 



anti, 63 



effects on winds, 63 



Dangers about the home, 507-512 



outside the home, 513-519 

 Davy safety lamp, 142 

 Deneb, 487 

 Densities, table of, 263 



table of household material, 262 

 Dentine, 222 

 Dew, 21 



on grass, 21 



things to remember about, 22 



cause of, 21 



Dipper, big, as an index, 483 

 Direction, 454 

 Disc, composition, 433 



for phonograph, 434 



magnified section of, 435, 436 

 Digestion, fat interfering with, 223 



in plants, 187 



meaning of, 183 



periods of, 224 

 Diphtheria, use of antitoxin for, 300 



Disease, methods of preventing, 321 



not inherited, 292 

 Disinfectants, 322 



bichloride of mercury, 322 



carbolic acid as, 322 



sunlight as, 322 



ultra violet rays as, 323 



ozone as, 323 

 Distance to stars, 476 

 Diamond point, 433 

 Dolphin, 488 

 Draco, 480 

 Ductility, 445 

 Dynamo, 395 



Ear, 412 



anvil of, 412 



cochlea of, 412 



diagram of, 412-414 



hammer of, 412 



human, 412 



stirrup of, 413 



tympanic membrane of, 412 

 Earth, 468 

 Echo, 413 



Eclipse of moon, 466 

 Eggs, freshness of, 238 



preserved, 238 



test for, 239, 240 

 Elasticity, 446 

 Electric bell, 406 

 Electric instrument, 401-403 

 Electricity, A.C. and D.C., 



measurement of, 385 



negative, 393 



positive, 393 



static, 393 

 Electrolysis, 257 

 Electrolytic method of cleaning silver, 



404 



Electroplating, 404 

 Elements, 257 



in the body, 203 

 Emergency treatments, 521 



