542 



INDEX 



Bacteria, in textiles, 320 

 Baking powder, burnt alum, 234 



phosphate, 234 



test of alum in, 235 

 Baking soda and cream of tartar, 234 



formulas, 235 



with hydrochloric, 233 



and molasses, 234 



use of, 233 

 Barograph, 55 

 Barometer, 48, 49 



aneroid, 51, 52 



aviator's, 55 



construction of, 51, 52, 53 



falling, 71, 72 



frog, 81 



leech, 81 



recording, 55 



rising, 71, 72 

 Battery, 410 



beehive, 485 

 " Bends," 49 

 Berenice's hair, 486 

 Black knot, 314 

 Blight, fire, 313 



potato, 314 

 Blaise Pascal, 49 

 Blood poisoning, 307 

 Blood pressure, 47 

 Bicarbonate of soda, test for, 228 

 Boiling-point, 82 



atmospheric pressure affects, 82 



varies, 83 



of different substances, 84 



other things affecting, 85 



Wegener's profile of, 85 



question on, 86 

 Bootes, 487 

 Boron, 228 



test for, 228 

 Bread, test for alum, 235 



sour milk, 234 



yeast in making, 235 

 Breathing, deep, 180 



Breezes caused by convection, 



land and sea, 74, 90 

 British Thermal Unit, 128 

 Brittleness, 446 

 Btu., diagram of, 129 



temperature and calory, 128, 159 

 Burn back, 159 



prevention of, 159 

 Burners, adjustment of, 159 



diagram of, 152 



experiment with, 158 



gas, 152 



use in gas stoves, 159 

 Burning back, 142 



cause of, 135 



of gas, 144 



prevention of, 159 



result of, 171 



wet, 184 

 Butter, coal tar in, 241 



renovated, 240 



test, 241 



Caisson, 50 



Calm, belt of, 73 



Calory, Btu. and temoerature, 128 



meaning of, 128 

 Cancer, 485 



Candle, gas generator, 144 

 Candle power, 376 



one foot, 376 

 Candy, value of, 220 



table of, 220 



Canis, major and minor, 484 

 Canes venatici, 486 

 Capilla, 482 

 Capillarity, 445 



in wick, 144 



experiment with, 144 

 Carbohydrates, 183, 198 



sources of, 198, 204 



use of, 204 

 Carbon, cycle, 183 



dioxide, 171 



