INDEX 



Absorption of light, 233 

 Acetic acid, 273 

 Acetylene, 244, 263 

 Acids, 272, 273, 274 

 Adenoids, 91 

 Adhesion, 46 

 Adiabatic heating, 157 

 Aeroplane, 69 

 Agonic lines, 190 

 Air, 73, 85, 213 



a mixture, 87 



importance to body, 88, 89 



functions of, 152 



movements of, 163 



as conductor, 197, 199 



and sound, 213 

 Albumen, 388 

 Alcohol, 264, 396-397 

 Algse, 329 

 Alkalies, 274 

 Alluvial deposit, 309 

 Ammonium hydroxide, 274 

 Ammonium nitrate, 276 

 Amrebse, 350 



Amorphous substances, 105 

 Amphibians, 359 

 Analysis, 277 



of chemicals, 278 



of soils, 288 

 Anemometer, 164 

 Aneroid barometer, 77 

 Animals, 350, 361 



one-celled, 350 



as food, 361 



clothing from, 361 

 Anode, 208 

 Anther, 318 

 Anti-toxin, 411 

 Anti-trade winds, 164 

 Ants, 356 



Aqueous humor, 237 

 Arc lamps, 203 

 Archimedes' principle, 116 

 Aristotle, 15 

 Artesian wells, 115 



Ash, 395 

 Asteroids, 2 

 Astigmatism, 239 

 Atmosphere, 73, 152 



density of, 73, 154 



depth of, 73 



composition of, 73, 87 



weight of, 74 



pressure of, 75, 157 



functions of, 152 



colors of, 153 



temperature of, 156 



movements of, 163 

 Atoms, 27, 194 

 Auditory canal, 216 



Bacteria, 86, 273, 294, 331, 351, 407 



Baking powders, 269 



Balance, 34 



Barometer, 75 



Bases, 272, 274 



Bees, 356 



Beetles, 364 



Bell, electric, 206 



Beverages, 395 



Big Dipper, 10 



Birds, 360 



Biuret test, 388 



Black knot, 348 / 



Blade, 326 



Blight, pear, 344 



potato, 344 

 Blizzard, 171 



Body, resisting power of, 410 

 Boiling point, 100-101, 134-135 

 Bordeaux mixture, 276, 344, 348, 



appendix 

 Brass, 252 

 Breathing, 89-90 

 Brickfielders, 171 

 Bronchial tubes, 89 

 Brown rot, 343 



Caissons, 80 

 Calcium hydroxide, 274 

 439 



