The Reason Why. Robert Kemp Philp

why are they white, 911

       Eye-balls, why do they sometimes become blood-shot, 912

       Eyes, why are they placed in the sockets of the skull, 929

       Eyes, why are we able to move them, 965

       Eye, why does the pupil look black, 968

       Eye, why is the pupil larger sometimes than at others, 969

       Eyes, why have we two, 970

       Eyes, why having two, do we see singly, 971

       Eyes, why are they provided with eyelids, 972

       Eyelids, why are they fringed with eyelashes, 973

       Eyes, whence are their humours derived, 976

       LESSON XXVII.

       Eyes, why do we feel inconvenienced by sudden light, 978

       Eyes, why if we look upon a bright object and turn away, are we unable to see, 979

       Eyes, why are we able to see better after a little while, 980

       Eyes, why do cats, bats, owls, &c., see in the dark, 981

       Eels, why are their eyes covered with a transparent horny coat, 1130

       Falling, what is the cause of bodies, 774

       Fanning the face, why does it make us feel cooler, 172

       Fata morgana, what is the cause of, 527

       Fatigue, why do we feel, 1017

       Feather, why does it fall to the earth more gradually than a shilling, 791

       Features, why do we preserve the same through life, 903

       Feel, why do we, 1004

       Feeling, why is it impaired when the hands are cold, 1006

       Feeling, why do the fingers prick and sting when they again become warm, 1007

       LESSON XXVIII.

       Feeling, why do persons whose legs or arms have been amputated, for some time continue to feel the part that has been removed, 1008

       Fibrin, what is it, 899

       Fingers, why can we raise them, 943

       Fingers, why can we draw them back after they have been raised, 944

       Fire, why does it burn more brightly when blown by a bellows, 27

       Fire, what is it, 82

       Fire, what are its properties, 83

       Fire, what elements take part in its maintenance, 84

       Fire, how does its combustion begin, 85

       Fire-screens, how do they contribute to keep rooms cool, 217

       Fire, why is it sometimes put out by blowing it when it is low, 262

       Fire, why does poking it cause it to burn more brightly, 287

       Fires, why do "blowers" improve the draft of air, 288

       Fire, why does it sometimes appear red, and without flame, 283

       Fire, what effect has it upon air, 284

       Fires, why do charcoal and coke burn without flame, 292

       Fires, why are charcoal and coke difficult to light, 293

       Fires, a new plan of kindling, 293

       LESSON XXIX.

       Fires, why in lighting them do we first lay in paper, wood, and coal, 298

       Fire, why does a poker laid across the top revive it when dull, 302

       Fire-places, why should they be near the ground, 303

       Fire, why does the blacksmith sprinkle water upon the coals of his forge, 308

       Fires, what is the best method of conveying air to, 684

       Fish, why does putrifying look luminous, 95

       Fishes, why have they fins, 1053

       Fishes, why are their fins proportionately so much smaller than the wings of birds, 1054

       Fishes, why have they scales, 1055

       Fishes, why do they float in streams, with their heads towards the current, 1056

       Fishes, why have they air-bladders, 1057

       Fishes, why do not their eyes contract, 1129

       Fishes, why have they no eyelids, 1132

       Fishes, why have they the power of giving their eye-balls a sudden motion, 1133

       Fishes, why are their tails so much larger than their fins, 1137

       Flame, what is it, 96

       LESSON XXX.

       Flame, what temperature is required to produce it, 101

       Flame of a candle, why does the lower part of the flame appear blue, 246

       Flame of a candle, why does the middle of the flame look dark, 217

       Flame of a candle, why does the upper part produce a bright yellow light, 248

       Flame of a candle, why is there a fringe of pale light around the flame, 249

       Flame of a candle, why does it terminate in a point, 250

       Flame of a candle, why does it lengthen when anything is held over it, 251

       Flame or spark, why does pressing it put it out, 253

       Flame of a candle, why does holding a candle upside down put it out, 257

       Flame of a candle, why is it more difficult to blow out the flame of a candle with a cotton wick than one with a rush wick, 258

       Flame of a candle, why does blowing sharply on it put it out, 259

       Flame of a candle, why will a gentle puff of air sometimes relight it, 260

       LESSON XXXI.

       Flame