Part 134

=Finger prints=, arch, (illus.), 520 composite (illus.), 521 of different people, 521 enlargements of, 524 how they identify us, 520 impressions of orang-outang (illus.), 522 loop (illus.), 520 palmary impressions (illus.), 522 specimen form of, record (illus.), 525 spike that caught a criminal (illus.), 524 thieves caught through their, 523 thumb imprint on bottle (illus.), 523 thumb impression on cash box (illus.), 523 thumb mark on a candle (illus.), 523 where first used, 522 whorl (illus.), 521

=Fingers=, why they hurt when cut, 143 why we have ten, 142

=Finger nails=, why we have, 142

=Fire=, alarms when first used, 308 first apparatus to fight, 308 first fire department, 308 first real, fire engine, 308 gases put out, 37 how man discovered, 289 how man learned to fight, 208 how man learned to make a, 289 mark, of civilization, 290 why it goes out, 37 why is it hot? 401 why put out by water, 222

=Fire making=, drilling (illus.), 289 drilling with bow string (illus.), 290 drilling, two persons (illus.), 290 first matches (illus.), 292 flint and pyrites (illus.), 290 flint, introduction of (illus.), 291 plowing (illus.), 290 pyrites (illus.), 290 rubbing sticks together, 42 sawing (illus.), 289 steel and flint (illus.), 291 tinder box (illus.), 291 tinder box, pistol (illus.), 291 with matches, 292

=Firedamp=, 262 explosion in safety lamp, 262

=Firearms=, first crude efforts of, 45 first real (illus.), 45 fuse of, 45 in early Chinese history, 44 first trigger of, 45

=Firing=, mortar, causes gas-rings, 27

=First= man-carrying aeroplane, 128 real telegraph, 421 stringed musical instrument, 480 telephone (illus.), 72 telephone line, 72 telephone switchboard (illus.), 74

=Fishes=, how they are born, 177 how they come to life, 177 motion in swimming, 233 what the eggs are, 177 why they cannot live in air, 232

=Flag=, made, how was American, 310 made, when was American? 310

=Flash pan=, early type, 45

=Flaxseed oil=, what it is, 227

=Flight=, of projectile, long, 30

=Flint-lock=, invented in seventeenth century, 46 invented by thieves, 46 still in use in Orient, 46

=Floor=, sounds through a, 79

=Flour=, bolters (illus.), 465 how made, 462 purifying machine (illus.), 463 sieves, 465

=Flowers=, why they have smells, 176

=Flying=, how birds learn, 178 boat, wonderful (illus.), 133 first Langley monoplane, 126 first successful aeroplane (illus.), 126 machine, first models, 127 some of the men who helped, 126 ten years of (illus.), 137

=Flying boat=, fun in (illus.), 135 gliding by, 137

=Flying boat=, interior arrangement (illus.), 134 monoplane type (illus.), 135 six-passenger hull (illus.), 134 speed of (illus.), 135 the wonderful, 133 views of (illus.), 133

=Flying machines=, 126 Bleriot flew in Europe (illus.), 129 Curtis biplane in flight (illus.), 136 Dr. Langley’s flying (illus.), 127 early types of, 127 first demonstrations, 130 first flight in Europe with, 129 first man-carrying aeroplane, 128 first models, 127 flying boat, 133 flying boat, exterior arrangement, 134 gliding experiments, 137 government interest in, 138 hull of flying boat, 134 interesting governments in, 138 Wright Bros., first flights, 130

=Focus=, in eye, 22

=Fog=, what it is, 105

=Food=, how we learned to cook, 308

=Foreign monoplanes=, some famous (illus.), 132

=Forsythe, LL.D. J.=, inventor of the primer, 47

=Freckles=, what makes them come, 125