486 



INDEX 



Fibers, silk, 133-134 



stem, 456 



wool, 130 

 Fibrin, 84 

 Filament, 424 

 Filtration, of water, 326, 342-343 



through charcoal, 62 

 Fire, building of, 56 



carbon dioxide, 57-58 



caused by electric wires, 221 



oxygen necessary for, 50 

 Fire damp, 119 

 Fire extinguisher, 6l 

 Fireless cooker, 30 

 Fireplace, 21, 22 

 Fish, 465-470 



hatcheries, 468-469 

 Flatiron, electric, 211-212 

 Flavoring extracts, 102 

 Flax, 132-133, 456, 457 



linseed oil from, 183 

 Flies, 472-474 

 Flint glass, 256-257 

 Flowers, 423-426 



development into fruit, 425 



structure of, 424 

 Flute, 287 

 Fog, 42 

 Food, adulteration, 97-104 



amount required, 74-76 



bulky, 76-77 



coloring matter in, 103-104 



cost of, 77-79 



effect of heat upon, 32, 82-90 



fuel value of, 68, 71 



materials lost in cooking, 88-89 



present in seeds, 436-437 



preservation of, 110-117 



repair of cells, 69 



values, 75, 78-81 



See Diet ; Digestion 

 Force pump, 324 



Forests and water supply, 345346 

 Formaldehyde in milk, 115 

 Formalin, 200 



Fountain, bubbling, 3 

 Freezing, effect of, 46 



point, 19 

 Fresh air, and health, 54 



consumed by gas burner, 127 



in underground work, 320 



in work under water, 332 

 Friction, 308-309 



produces heat, 52 

 Frog, 469 

 Frost, 42 

 Fruits, canning, 114-115 



development of, 425 



fancy, 427 



removal of stains, 147 



source of, 423-424 



uncooked, 89 



water in, 73 

 Fuel value of food, 68 

 Fuels, 118-128 



briquettes, 122 



coal, 119-123 



coke, 122 



comparison of heating po > er of, 128 



gas, 126-128 



kerosene, 123-125 



wood, 118 

 Fur, 136-137 

 Furnace, 22-23 



Galvanized iron, 54, 177178 

 Galvanometer, 234 

 Garbage, 144, 203 

 Gas, acetylene, 279-280 



as fuel, 126-128 



burners, 127, 277-278 



economy of, 37-38 



engines, 317-318 



heating power of, 128 



mantles, 277-278 



preparation from coal, 126-127 

 Gas, natural, 278 



origin of, 36 

 Gasoline, heating power of, 128 



in engines, 317-318 



