INDEX 



Absorption of light, 272 

 Acetanilide, 194-195 

 Acetic acid, 64, 65, 99 

 Acetylene gas, 279-280 

 Acids, 140 



effect on aluminium, 179 



effect on copper, 176 



effect on lead, 178 



effect on tin, 177 



use with baking soda, 150-151 

 Adenoids, 55-56 

 Adulterants, 97-104 



detection by temperature, 20 

 Adulteration of fabrics, 135-136 



of foods, 97-104 

 Aeronauts, 382 

 Agar, 107 

 Air, 377-388 



amount needed, 27, 59 



breathing, 54-56 



characteristics of, 321, 377 



components of, 385 



compressed, 320 



currents of, 27-28, 35-36, 401-404 



expansion of, 14-15 



pressure of, 321, 378-379 



weight of, 381 



work of, 388-392 



See Atmosphere 

 Albumen, 82-83 

 Albumin, 84-85 

 Alcohol, in lacquer and shellac, 185 



in patent medicines, 195 



in varnish, 184 

 Alcohol, wood, 64-65 

 Alimentary canal, 91-92 

 Alkalies, 142 

 Alloys, 178-179 



Alluvial fan, 365 



Alum, in baking powders, 151 



in catsup, 116 



in dyeing, 170 

 Aluminium, 179-180 



cleaning, 179 

 Ammonia, 147. 

 Ampere, 209, 239 

 Amyl, acetate, 102 



butyrate, 102 



valerate, 102 



Aniline dyes, 103-104, 169 

 Animal charcoal, 63 

 Anther, 424, 427 

 Anthracite coal, 1 19 

 Antipyrine, 194 

 Appetite, 93 



Apple, chemical substitute for, 102 

 Arctic regions, 394-396, 398 



plant life in, 270 

 Armature, 219 



of motor, 23 1 

 Arsenic, 104 



Artificial lighting, 275-280 

 Asbestos, 29 

 Ashes, 123 



in soap making, 143 

 Atmosphere, 377-392 



chemical action of, 391 



pressure of, 321, 378-379 



saturated, 4344 



work of, 388-392 



See Air 



Bacteria, 105-117, 196-198 

 as nitrogen gatherers, 187-188 

 decay caused by, 108-111 

 development of, 107-108 



481 



