INDEX 



lAn asterisk following a page number indicates an illustration.) 



Acids, 160 



Agassiz, Louis, 301 * 

 Agriculture, science of, 164 

 Air, composition, 149 



density, 96 * 



how warmed, 77 



humidity, 107 



sac, 302 * 



saturated, 107 



solution in water, 94 * 

 Aldebaran, 15, 19 

 Alimentary canal, 303 



of fish, 304 * 

 Alloy, 153 

 Altitude, 117 

 Aluminum, 154 

 Amalgams, 155 

 Analysis, chemical, 158 

 Animals, care of the young, 299 



carnivorous, 260 



herbivorous, 260 



need of food, 259 



omnivorous, 260 



one-celled, 289 * 



processes of nutrition, 306 



relation to plants, 260 * 



reproductive organs, 298 

 Antagonistic muscles, 295 

 Antares, 16 

 Anthers, 276, 277 * 

 Anthracite, 186 

 Antidotes, 165 

 Apparatus, 62 

 Arc lights, 136 

 Arctic circle, 25 

 Asbestos, 172 

 Asphyxiation, 141 

 Astronomy, ancient, 13, 19 

 Atmosphere, variations in composi- 

 tion, 107 

 Atmospheric pressure, 95 



differences, 96 *, 98 



Atmospheric pressure, direction, 100 



on the body, 98 

 Atom, 156 

 Axle, 59, 60 

 Axon, 291 



Balance, equal arm, 63, 64 * 



spring, 63 * 

 Barometer, 97, 98 

 Bases, 161 

 Bean plant, 265 



flower, 276 



ovary, 278, 279 * 



structure of seed, 278, 279 

 Bell, electric, 135 

 Belt of Calms, 113 

 Big Dipper, 16, 17 *, 18 *, 19 

 Blast furnace, 169 * 

 Block mountains, 203 * 

 Blood vessels, 305 

 Body, definition, 47 



temperatures, 305 

 Boiling point, 68 

 Boulders, 248 

 Brittleness, 54 

 Brownstone, 180 

 Bunsen burner, 142 *, 143 



Calcite, 172 



Calendar, 28, 29 



Caloric, 77 



Camera, 125, 126 * 



Candle power, 120 



Canis Major, 16 



Capacity, measurement of, 52, 53 * 



Capillarity, 90, 91 * 



Carbon, 150 



Carbon dioxide, an important oxide, 

 159 



excretion of, 160, 258 

 fire extinguisher, 144 *, 145 

 307 



