The Reason Why. Robert Kemp Philp
rel="nofollow" href="#ulink_c8c01689-6101-5bf0-bfed-af6c370bd421">261
Flame of a candle, why will a piece of paper twisted to form an extinguisher put it out, 263
Flame of a candle, why does it become dim when the wick is loaded with carbon, 267
Flames of a fire, why do some appear much whiter than others, 280
Flames of a fire, why do some of them appear blue, 282
Flesh, why does it heal when we cut it, 902
Flesh-eaters, why do they satisfy themselves with a rapid meal, 1092
Flesh, why do the marks of deep cuts remain, 905
Flesh, why does that under the nails look red, 907
Flies, how can they walk on the ceiling, 663
Flies, why have they fine hairs growing on the extremities of their legs, 1102
Flowers, what is the chief cause of the differences of their temperatures, 227
Flowers, why may wet weather be expected when their perfume is strong, 1103
LESSON XXXII.
Flowers, why, if certain close, may rain be expected, 1116
Flying-top, why does it rise on the air, 843
Flying-top, why does it return to the earth, when its rotations are expended, 844
Focus, what is a, 81
Fogs, what are they, 365
Fogs, why are certain coasts very liable to them, 366
Fogs, what are dry, 367
Fogs, why do they frequently rise in the morning and fall in the evening, 371
Fogs, why do they sometimes rest upon a locality for days together, and then disappear, 372
Food, why do we eat it, 869
Food, why do we eat animal and vegetable, 172
Food, why do we masticate it, 871
Food, how does it descend into the stomach, 875
Food, why do we not feel it being transmitted through the throat, 876
Food, why do we feel uneasy after eating to excess, 877
Food, why do we feel drowsy after eating heartily, 878
Food, why do some portions nourish us, while other portions are useless, 883
LESSON XXXIII.
Fossil, vegetable, what is it, 272
Friction, why does it produce heat, 321
Friction, why does rubbing two surfaces together attract latent heat, 322
Frost, why is the air warmer during, 163
Frost, what is white, 412
Frost, what is black, 413
Frost, why are black frosts said to last, 414
Fruit, why do gooseberries, plums, &c., taste acid, 1184
Fruit, why do ripe taste sweet, and unripe sour, 1185
Fruits, why are succulent most abundant in tropical climates, 1207
Fruits and vegetables, why do they ripen in succession, 1284
Furs, why are they worn in winter, 166
Galvanism, what is it, 635
Gas, what kind lights our streets, 56
Gas, why does it expand in thin air, 833
Geology, what has been its influence upon botanical geography, 1249
Giraffes, why have they small heads, 1322
Giraffes, why have they long necks, 1323
Giraffes, why have they long and flexible tongues, 1324
LESSON XXXIV.
Giraffes, why are their nostrils narrow and small, and studded with hairs, 1325
Glass upon a lamp, why does it increase the brilliancy of the light, 266
Glass, why is it transparent, 506
Glass, does transparent reflect any light, 507
Glow-worms, why have they brushes attached to their tails, 1127
Glow-worms, why do they emit light, 1128
Gnats, why are their larvæ and pupæ found in water, 1314
Gnats, why may fine weather be expected if they fly in large numbers, 1110
Grasses, why are they so widely diffused throughout nature, 1166
Grasshoppers, why are they comparatively active in their pupa stages, 1293
Gravitation, what is the attraction of, 774
Guano, why is it a good manure, 1262
Gum resins, what are they, 1255
Gums, vegetable, what are they, 1254
Gunpowder, why does it explode, 808
Gutta-percha, whence is it obtained, 1254
LESSON XXXV.
Hail, what is it, 448
Hail, why is it supposed that the electrical state of the clouds affects the formation of hail, 449
Hail-storms, why do they usually occur by day, 450
Hairs, why do they grow across the passages of the nostrils, 993
Halo, what is a, 494
Halo, what is the cause of a, 495
Haloes, why are they sometimes large, and at other times small, 496
Haloes, why do they foretell wet weather, 497
Hands, why when we hold them against the candle do we perceive a crimson colour, 906
Hay-stacks, why do they sometimes take fire spontaneously, 316
Head, why is it set upon the neck, 928
Hearing, why do people engaged in battle frequently lose their, 991
Hearing, death