INDEX, AND INDEX LESSONS. |
? The numbers refer to the Questions. The Index Lessons do not correspond with the Chapters, but are designed to bring together in their alphabetical connection, all the Questions and Answers upon each particular subject included in the work.
tm.html#question_75" class="pginternal">75 Caloric, how may it be excited to develope heat, 79 Caloric, is there any in ice, snow, water, marble, &c., 89 Caloric, how do we measure the quantity of in any substance, 329 Caloric, how does it travel, 332 Caloric, how do we know that it is caloric which fuses metals, 334 Calves and lambs, why have they no horns, 1069 Camel, why has its stomach a number of distinct bags, 1065 Candles, why do tallow require snuffing, 264 LESSON XIII. Candles, why do composite and wax not require snuffing, 265 Candle, what becomes of it after it is burnt, 269 Capillary blood-vessels, why are they found in every part of the system, 919 Capillary attraction, what is it, 780 Carbonic acid gas, how is it formed, 9 Carbonic acid gas, what becomes of it, 10 Carbonic acid gas, is it heavier or lighter than air, 11 Carbonic acid gas, what are the chief sources of, 16 Carbonic acid gas, what is its effect upon the human system, 21 Carbonic acid gas, what becomes of that formed by combustion, 59 Carbonic acid gas, what proportion is dangerous to life, 60 Carbonic acid, what is it, 798 Carbonic acid, where does it chiefly exist, 799 Carbonic acid, what are its pure states, 800 Carbon, what is it, 18 Carbon, will it produce flame when burnt in oxygen, 106 Carbon and hydrogen, what differences characterise the combustion of, 268 LESSON XIV. Carbon, what is the purest form of it, 277 Card, why do the images on each side blend while a card is revolving, 846 Caterpillars, why do they appear in the spring, 1289 Caterpillars, why do they eat voraciously, 1290 Caterpillars, why do they pass into the state of the chrysalis, 1291 Caterpillars, why do they become torpid in the chrysalis, 1292 Caterpillars, why do they attach themselves to the leaves of plants when in the chrysalis, 1294 Cats, &c., why do they see in the dark, 981 Cats' eyes, why are the pupils of nearly closed by day, 982 Cats, &c., why have they whiskers, 1096 Cattle, why if they run round in meadows may thunder be expected, 1122 Ceiling, how did Mr. Sands walk on the, 664 Champagne, why does it effervesce, 806 Champagne, why do bubbles rise from it in two or three columns, 807 Charcoal, why is it dangerous to burn it in rooms, 20 LESSON XV. Charcoal fires, why do they not give flames, 107 Charcoal, what is it, 275 Charcoal, why does it act as a disinfectant, 809 Chicory, what is it, 1196 Chimney, why does it cease smoking after the fire has been lighted a little while, 680 Chimney, why does a long one create a better draught than a short one, 882 Digestion, how is the nutritious matter taken from that which is innutritious, 885 Digestion, what becomes of the nutrition when it enters into the circulation, 886 Dish-covers, why should they be plain in form, and have bright surfaces, 203 Dogs, geographical distribution of, 1333 Dream, why do we, 1020 Drowsiness, why is it felt in crowded rooms, 22 LESSON XXIII. Ducks and geese, why do they dash water over their backs on the approach of rain, 1105 Ducks and geese, why have they square-pointed bills, 1044 Dyes, vegetable, what are they, 1259 Ear, why is it spread out externally, 984 Ears, why do hairs grow across them, 986 Ear-wig, why is it so called, 986 Ears, why is wax secreted in the, 987 Ears, why do singing noises occur in the, 988 Ears, why do people become deaf, 989 Ears, why do people accustomed to loud noises feel no inconvenience from them, 990 Ears of animals of prey, why do they bend forward, 1063 Ears of animals of flight, why do they bend backward, 1064 Earth, why is it warmer than air during sunshine, 398 Earth, why is it colder than air after sunset, 399 LESSON XXIV. Earth, how can man weigh the, 784 Earth, what is the weight of the, 788 Earth-worms, why have they no feet, 1085 Echoes, why do some occur immediately after the sounds, 742 Echoes, why do some occur at a considerable interval after the sound, 743 Echoes, why do some change the tone and quantity of sounds, 744 Echoes, why are there sometimes several to one sound, 745 Echoes, are they caused only by distant objects, 746 Echoes, what are they, 741 Electricity, what is it, 561 Electricity, why is it so called, 562 Electric fluid, why is it so called, 566 Electrics, what substances are, 567 Electricity, what is positive, 568 Electricity, what is negative, 569 Electricity, what is vitreous, 570 Electricity, what is resinous, 570 Electrical phenomena, what produces them, 571 Electricity, how does its equilibrium become disturbed, 572 Electricity, how does it seek to regain its equilibrium, 573 Electricity, what substances are conductors, 574 Electricity, what substances are non-conductors, 575 Electricity, what substances are insulators, 576 LESSON XXV. Electricity, what is the effect when a current of electricity meets with an insulator, 577 Electric sparks, what is the cause of, 578 Electricity, why does lightning attend it, 584 Electricity, why does it affect the
i> Heat, how is it diffused through the ocean, 233 Heat, why is it developed during chemical changes, 312 Heat, what are the sources of, 323 Heat, what is the accepted theory of, 328 Heat, what is the point at which it becomes luminous, 545 Heat, what is the relative intensity of primary and reflected, 548 Heat to cold, why does a sudden change bring on illness, 1013 LESSON XXXIX. Heat of the earth, Humboldt's opinion upon the internal, 1335 Heat of the earth, Hunt's opinion upon the internal, 1336 Hear, why do we, 983 Hiccough, why do we, 1027 Hoar-frost, what is it, 362 Hoar-frost, why does it foretell rain, 363 Hoar-frosts, why are they so frequent, and black-frost so unfrequent, 412 Hogs, why have Indian large tusks turning back towards their eyes, 1068 Hog, why is the under-jaw of the, shorter than the upper-jaw, 1039 Hoop, why does it roll without falling to the ground, 861 Hoop, why does it when falling make several side revolutions, 862 Horses, why have they smaller stomachs proportionately than other animals, 1097 Horse, why has it no gall-bladder, 1098 Horses, why is the secretion of their eyes thick and glutinous, 1134 Horses and cattle, why do they stretch out their necks, and snuff the air on the approach of rain, 1106 Horse-chestnut, why is it unfit for food, 1203 Hot, when is a body said to be, 77 LESSON XL. Hot water, why does it feel hotter in a metal jug than in an earthenware one, 126 Hot metal, why does it feel hotter than hot wool, 130 Hot metal and hot wool, which would become cold first, 131 Hot and cold bodies, why, when placed near each other, do their temperatures approximate, 331 Humming-tops, why do we see the figures painted on them before they spin, but not while they are spinning, 813 Humming-top, why does it make a noise, 810 Hydrogen, what is it, 49 Hydrogen, will it support animal life, 50 Hydrogen, will it support combustion, 51 Hydrogen, why will it explode, 52 Hydrogen, where does it chiefly exist, 54 Hydrogen, how is it obtained from coal, 57 Hydrogen-gas, is an escape of it dangerous to life, 63 Hydrogen-gas, what proportion mixed with air will explode, 64 Hydrogen-gas, does it rise or fall, 66 LESSON XLI. Hydrogen-gas, what proportion is dangerous if inhaled, 67 Hydrogen-gas, what proportion may be recognised by its smell, 68 Hydrogen-gas, may the use of it be considered dangerous, 70 Hydrogen-gas, what sources of it are there in our dwellings, 69 Hydrogen, why will it burst into flame when coals become heated, 100 Hydrogen, why does hi-carburetted burn with a whiter flame than common coal-gas, 281 Ice, why are blocks
o they revolve when propelled along the ground, 818 Marbles, why do striped appear to have more stripes when they are rolling than when at rest, 819 Marbles, why do they rebound when dropped upon the pavement, 820 Marbles, why do they roll furthest upon smooth surfaces, 821 Marbles, how many forces contribute to stop their rolling, 882 Marbles, why do the stripes upon them disappear when they are spinning rapidly, 823 Marbles, why are the rings upon them most perceptible at the "poles," while they are spinning, 824 LESSON XLIX. Matches, do they ignite spontaneously, 313 Meat, why is it sooner cooked when a tin screen is placed before the fire, 213 Metal, why does it run like a fluid when melted, 333 Mirrors, why do we see our features therein, 209 Mirrors, why do we see our faces in them, 512 Mirrors, what has the glass of to do with the reflection, 514 Mirrors, why do compound mirrors reflect many images of one object, 515 Mirrors, why do reflections appear as far behind a mirror as the object reflected stands before it, 518 Mirage, what is the cause of the, 527 Mists, what are they, 368 Mists and fogs, what is the difference between them, 369 Mists end fogs, why do they disappear at sunrise, 370 Mistletoe, why have its berries a thick viscid juice, 1177 Mistletoe, how are its seeds conveyed to the bark of trees, 1178 Moles, why have they hard flat feet, 1074 Mole's fur, why is it glossy and smooth, 1075 LESSON L. Moles, why are they permanent, 904 Moles, why may rain be expected when they throw up their hills, 1117 Monsoons, what are they, 672 Monsoons, what is the cause of, 673 Mornings, why are they usually clear when frosty, 410 Mother-of-pearl, what causes the rich tints displayed by, 500 Moths, why do they fly by night, 1297 Moths, why are their bodies generally covered with thick down, 1228 Moths, why do they fly against the candle-flame, 1299 Muscles, how many are there in the human body, 941 Muscle, what is the constitution of a, 942 Muscles, what degree of strength do they possess, 945 Muscles, what is the stimulus which sets them in action, 946 Mussels, why have they tendinous cords proceeding from their shells, 1086 Natural phenomena, a world of miniature, 690 Nails, why have we got them at the fingers' ends, 908 Nails, why is there a circular line of whitish colour at the root of the, 909 LESSON LI. Nails, why do white spots occur upon the, 916 Needle, why will it float if laid carefully upon water, 795 Nerves, what are they, 951 Nervous system, of what does it consist, 955 Nerve, what is the constitution of a, 956 Nervous fluid, what is
lass="indx">Snails, why do we see none in the winter time, 1311 Snails, why can they live in sealed shells, 1312 Sneeze, why do we, 1024 Snipes and woodcocks, why have they long, tapering bills, 1042 Snore, why do we, 1028 Snow, why does it keep the earth warm, 160 Snow, why is it a good non-conductor of heat, 162 Snow, what is it, 440 Snow, why is it white, 441 LESSON LXV. Snow, why is it warm, though white garments are cool, 442 Snow, why is it always on the tops of high mountains, 443 Snow-line, what is meant by the, 445 Snow, what is red, 446 Soda-water, why does it effervesce, 802 Soils, why are clayey unfavourable to vegetation, 1160 Soils, why are sandy unfavourable to vegetation, 1162 Soils, why are chalk unfavourable to vegetation, 1162 Soils, why are mixed favourable to vegetation, 1163 Soils, why do farmers manure their land, 1165 Soot, why should it be prevented from accumulating at the bottom and sides of saucepans, 205 Soot, what is it, 290 Sound, what is it, 716 Sounds, what causes the air to produce, 717 Sounds, how do we know that they are produced by vibrations, 718 Sounds, how do we know that without air there would be none, 719 Sounds, how are the vibrations of sonorous bodies imparted to the air, 720 LESSON LXVI. Sounds, how rapidly do the vibrations of travel, 721 Sounds, do all sounds travel at the same rate, 722 Sounds, why are bells and glasses stopped from ringing by touching them with the finger, 723 Sounds, why does a cracked bell give discordant, 724 Sounds, why do we see the flash of a gun before we hear the report, 725 Sound, why does the marching of long ranks of soldiers appear to be irregular, 726 Sounds, what are the numbers of vibrations that produce various, 727 Sounds, why does the length of a wire or string influence the sounds it produces, 728 Sound, why does the tension of a wire or string affect its vibrations, 729 Sound, why are some notes low and solemn, and others high and quick, 730 Sound, why can our voices be heard at a greater distance when we speak through tubes, 731 Sound, is air a good conductor, 732 Sounds, why can we hear them at a greater distance on water than on land, 733 LESSON LXVII. Sound, why do sea-shells give a murmuring noise when held to the ear, 734 Sound, why can people in the arctic regions converse when more than a mile apart, 735 Sounds, why do savages lay their heads upon the earth to catch sounds, 736 Sounds, why can church clocks be heard striking more plainly at some times than at others, 737 Sound, why may the scratching of a pin at one end of a long pole be heard at the opposite extremity, 738 Sound, why is the hearing of deaf persons assisted by ear-trumpets, 481 Water, what causes it to flow from a pump, 651 Water, why does it run through a syphon, 655 Water, what is it, 748 Water, why does it become solid when it freezes, 751 Water, why does it boil, 753 Water, what proportion of the earth's surface is covered by it, 554 Water, why does it dissolve substances, 758 Water, why does hot dissolve more readily than cold, 759 Water, why is it sometimes hard, 760 Water, why is rain-water soft, 761 Water, why is it difficult to wash in hard, 763 Waters, why are some impregnated with mineral matters, 767 Water, why does stagnant become putrid, 769 Water, is there danger attending drinking it on account of animalculÆ, 770 Water, what are the means by which it may be purified, 771 LESSON LXXVI. Water, what is the pressure of, 775 Water, why will a drop upon the blade of a knife leave a dark spot, 777 Water, why does it roll in agitated globules when dropped upon hot iron, 796 Water, why does oil float upon it, 797 Water, why is spring fresh and invigorating, 803 Water, why is boiled flat and insipid, 804 Weather, why does a yellow sunset foretell wet, 534 Weather, why does a red sunset foretell fine, 535 Weather, why does a red sunrise foretell wet, 536 Weather, why does a grey sunrise foretell dry, 537 Weather, barometrical indications of, 708 Whales, why have they a large development of oily matter about their heads, 1068 Whale, why has it feathery bones extending from its jaws, 1095 Whales, why are, their eyes provided with very thick coats, 1131 Wheat, why do the ears stand up by day and turn down by night, 1175 Wheat, what is it, 1199 LESSON LXXVII. Wheat, what is the northern limit of, 1235 Wheat, why is silica diffused over its stem, 1261 Wheat-crops, why do they greatly exhaust the soil, 1263 Whirlwinds, what are they, 678 Why do we see, 963 Why do we wink, 975 Why do we weep, 977 Why do we hear, 983 Why do we taste, 986 Why do we smell, 992 Why do we feel, 1004 Why do we sleep, 1019 Why do we dream, 1020 Why do suppers produce dreaming, 1021 Why do we yawn, 1022 Why do we cough, 1023 Why do we sneeze,
"God looked down from heaven upon the children of men, to see if there were any that did understand that did see God."—Psalm liii.
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