796 INDEX. 



Page. 



Air, constitution and condition of 203 



country, benefits of 292 



currents at great heights 316 



disease germs in 377 



infections through 273 



does not transmit animal diseases 254 



dry, favorable to health 287 



dust in the 219 



effect on mental qualities 293 



effects of smoke in 359 



effects of variation in pressure of 181 



electricity in „ 91, 337 



expired, composition of 389, 407 



investigations of '. 15 



first analysis of 149 



fresh, quantity needed per hour 357 



gaseous impurities in 231 



ground, impurities in 298 



impure, diseases caused by 251 



impurities from drainage in 243 



in close rooms 408 



in factories, impurities of 249 



in ocean depths 142 



insulating power of 94 



liquefaction and solidification of 140, 216 



living germs in 238 



number of molecules in 138 



of lecture rooms, analyses of 175 



of mines, composition of 241 



of towns, effect on mental and bodily health 290, 349 



organic matter in 323 



organic particles from evaporating fluids 299 



overcooling and supersaturation of 338 



particles suspended in 237 



pressure variations of - 139 



physical properties of 138 



propagation of sound in 309 



pure, influence on mental qualities - - 279 



purified by clouds and rain 223 



purified by winds 190 



quantity inhaled daily 351 



sewer, impurities of % 243 



smoky, effects of 235 



solidified 140,216 



solid impurities in 231 



particles in, effect of 198, 204 



sources of ammonia in 247 



subjects for research in study of 317 



temperature at great heights 315 



volumes of different gases in 352 



weight of 138 



Air and life, essay by Henry de Varigny on 85, 135 



Air of towns, by Dr. J. B. Cohen 349 



effect on mental and bodily health 290 



Airy's correctors for compass variation Ill 



