INDEX 



545 



Emmetropia, 344 

 Emulsion, 268 

 Enamel on teeth, 222 

 Engines, gasoline, 162, 163 

 Enzyme, 186 



and digestion, 221 

 Equinox, 469 

 Evaporation, effects of, 42 



effects of winds, 2 



from soils, 3 



questions on, 10 



rate of, 2 



relation to bodily comfort, 11 



relation to life, 8 

 Expansion, 112 



amount of, 112 



causing ice to float, 115 



in incandescent lamps, 117 



of metals and solids, 117 



in pop corn, 113 



questions on, 118 



unequal, 117 



use of in cooking, 112 



of water, 113 

 Explosions, 143 



experiment, 143 



of gas, 142 



of gasoline, 143, 162 



of hydrogen, 143 



mixtures, 143 

 Eye, accomodation of, 345 



blind spot of, 360 



evidence of strain, 349 



far sighted, 346, 334 



lens of, 335 



near sighted, 346 



normal, 344 



position of, 359 



protection of, 354 



protectors of, 358 



trouble with, 344 



why two, 360 

 Eyeball, 357 



Fats, 183, 198 



amount needed, 198 



Babcock test for, 226 



in cooking, 223 



frying with, 223 



in milk, 226 



sources of, 198, 203 



use of, 203 

 Faucets, 275 

 Fever, scarlet, 307 



turn of, 292 



typhoid, 300 

 Fiber in cloth, 269 



determination of, 269 

 Filter, house, 279 

 Fire, automatic extinguishers of, 133 



blight, 314 



causes of, 388 



discovery of, 135 



extinguisher, 139-140 



hydrant, 266 

 Fire and matches, 506 

 Fish, deep sea, 264 

 Flame, parts of, 142 



luminous parts of, 142 



non-luminous temperature of, 142 

 Formaldehyde, test for, 228 

 Formalhaut, 487 



Fog, 23 



FlageUa, 290, 293 

 Flash back, 159 



prevention of, 160 

 Food and work, 193 



and weight, 192 



calories per day, 191 



containing vitamines, 200, 201 



containing minerals, 202 



composition table, 203, 204 



chewing of, 222 



cost of, 190 



for overweights, 193 



for underweights, 193 



for hot weather, 193 



measurement of, 189 



