304 



HLKMKNTS OF < I KNKKA L SCIKN'CK 



Bromine, 61 



Bubonic plague, 101 



Buoyancy, 132-135 



Buoys, 152 



Burning, of candle, 55-57, 62-64 



Caisson, 2, 3* 



Calcium, 61 



Calms, belt of, 45 



Canals, 147, 150, 151 



Candle, 55-57, 62, 63 



Canning fruits, 86 



Canoe, travel by, 149, 150 



Capillarity of soil, 207 



Carbohydrates, 74, 76, 247, 248, 256 



Carbohydrates, manufacture of, 74- 



. 78 



Carbon, 61, 63, 67, 74 



Carbon dioxide, 63, 64, 65, 68, 69, 



74, 81, 187, 203, 260, 268 

 Caves, 194 

 Cells, 71, 73, 237 

 Centigrade thermometer, 11, 12* 

 Cheese-making, 87 

 Chemical change, 60 

 Chimneys, 14 

 Chlorine, 61 

 Chlorophyll, 74-76, 253 

 Chloroplast, 73, 78 

 Choke damp, 65 

 Cholera, 87 

 Chromium, 61 

 Chrysanthemum, 297* 

 Circulation, 257, 258*, 259, 267 

 Cities, origin of, 149, 150 

 City block, a crowded, 89* 

 Clay, 200-202 



Cleanliness and disease, 96, 97 

 Climatic influences of water, *136- 



146 



Clock, 180* 

 Clouds, 25*, 41 

 Coal, 135, 186, 187 

 Coal, energy in, 186, 187 

 Coal, formation of, 186*, 187 

 Cobalt, 61 



Codfish, overproduction of, 283 

 Cold storage, 111-113 

 Cold waves, 37, 38, 39*, 143*, 144 

 Cooling effects of evaporation, 109 

 Cooling of land and water, 142-144 

 Commercial relations of Great Lakes, 



147, 148, 149*-153 

 Composition of foods, 242, 243 

 Compounds, 60, 62-64 



Compressed air, 8* 



Condensation of water vapor, *23- 



27, 36, *41-47 



Contaminated food, 265-267 

 Convection, 13*, 14 

 Copper, 61, 108, 135 

 Cork, 135 



Com, overproduction of, 281, 282 

 Corn, progressive breeding in, 297- 



299 



Com, variation in, 290, 291, 296-299 

 Crops, value of, 233 

 Culex, 98* 

 Cyclones, *33-45 



Dams, 130, 131*, 167*, 211* 



Day, length of, 18, 19* 



Death rate, 92*, 93, 155*, 169*, 162 



Decomposition, chemical, 60 



Deforestation and erosion, *216-220 



Densities, table of, 135 



Density, 134, 135 



Dependent plants, 76*, 7 7, *82-85 



Desert-plant formations, 228* 



Dew point, 24, 25, 26 



Diastase, 248 



Diffusion, 50, 51, 54 



Digestion, 248, 249, 256, 257 



Dikes, 130 



Diphtheria, 87 



Disease, destruction by, 285 



Disease and cleanliness, 96, 97 



Disease germs, *88-101 



Distillation, 107*, 108 



Diving bell, 3 



Dodder, 77* 



Drainage, *205-214 



Drainage, natural, 208 



Drainage canal of Chicago, 93 



Dry farming, 212, 213 



Dunes, *221-223 



Dust, 65, 79-82* 



Earth, crust of, 66, *191-223 



Earthworms and soil, 203 



Ebony, 135 



Efficiency of machines, 179 



Electric power, 75 



Electricity, 75 



Elements, 60, 61 



Elevation and air pressure, *8-10 



Energy, 165-189 



Energy, kinetic, 181 



Energy, measurement of, 181 



Energy, mechanical, *180-184 



