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