INDEX 



Absolute temperature, 142, 146 

 Absorption, 98 

 Accidents, 233-239 



by automobiles, 239 



liability for, 237-238 

 Acids (bases, salts), 180-183, 190- 

 191 



definitions, 182-183 



formulae for, 181 

 Adenoids, 6 

 Adulterations, 48 

 Agriculture, courses in, 303, 316, 



317, 322, 332 

 Air, as respired, 19-23 



compressed, 56, 120-122 



constituents of, 23, 112 



in soils, 251 



liquid air, 116-118 



properties of, 110-113 



weight of, 112 

 Air-brakes, 122-123 

 Air drills, 122-123 

 Alcohol, 72-76, 78, 212, 238 



effect on nerve centres, 76, 79- 



80, 238 



Alkali, 178, 189, 191 

 Aluminum, 188-189 

 Ammonia, uses of, 116, 118, 177 

 Amusements, 68 

 Anaesthetics, 78 

 Antiseptics, 39 

 Antitoxins, 37, 41, 60 

 Apple raising, 319-325 



Asbestos, 145 

 Atmosphere, 110-131 



currents in, 113, 123-131 

 density of, in, 123 

 depth of, in, 113 

 Atmospheric moisture, effect on heat 



from sun, 112 

 in relation to health, 20, 113, 



135-136 



Atmospheric pressure, 114-132 

 applications of, 119-123 

 currents due to, 123-126 

 effects on persons of changes in, 



115, 122 



measurement of, 114 

 relation to altitude, 115 

 to density, 118, 126-127 

 to wind velocity, 114 

 Atoms, 173 



Bacteria, 36-45, i?5, 251, 324 

 nitrogen-fixing, 44, 254, 313 



Balanced diet, 209, 213, 219-224 



Balloons, 115 



Barometer, 114-115, 118, 131 



Bathing, 28 



Batteries (cells), 170, 184, 187, 189 

 storage, 187 



Birds, 275-280, 297 



bills, and feathers, 276-277 

 migrations, 277-278 

 usefulness of, 278-279 



375 



