The Reason Why. Robert Kemp Philp
1108
LESSON LXVIII.
Spiders, why may wet weather be expected when they hide, 1109
Spiders, why may wet weather be expected when they break off their webs and remove them, 1113
Spider, why, if the webs of the gossamer fly about in autumn, may east winds be expected, 1124
Spiders, gossamer, why can they float through the air, 1125
Spinal cord, what is the, 952
Spinal cord, why is it placed in the back-bone, 953
Spinal-cord, how do the branches pass out from it, 954
Spontaneous combustion, what substances are liable to it, 317
Spontaneous combustion, has it ever occurred in living bodies, 319
Spontaneous combustion, why does it occur in the case of the drunkard, 320
Spoon-bill, why has it a long expanded bill, lined with sharp, muscular points, 1045
Spoon-bill, why has it long legs, 1046
Squint, why do some people, 967
Starch, what is it, 1202
Star-lit nights, why are they usually colder than cloudy nights, 350
Stars, why do they twinkle, 484
LESSON LXIX.
Stars, why does their twinkling foretell bad weather, 485
Steam, why does it issue from the spout of a kettle, 750
Storms, what is the cause of, 676
Storms, why do the most violent occur in and near the tropics, 677
Straw, why is it frequently used for manure, 1264
"Sucker," why does it raise a stone, 860
Sugar, what is it, 1197
Sugar-cane, where is it cultivated, 1226
Sun, what is its distance from the earth, 452
Sun, what is the, 455
Sun, from what does its luminosity arise, 456
Sun and moon, why do they appear smaller when near the meridian, than when near the horizon, 525
Sun, why do we see it before sunrise, and after sunset, 482
Sun, what is the magnitude of the, 787
Suppers, why do they cause dreams, 1021
Swallows, why may wet weather be expected when they fly low, 1104
Syringe, why does pressing in the handle force out a jet of water, 856
Syringe, why will not the water run out, unless the handle is pressed in, 857
LESSON LXX.
Syringe, why will the water leak out, but not run, 858
Syringe, why cannot the handle be pressed in, if a finger is kept on the orifice, 859
Tannin, what is it, 1257
Taste, why do we, 996
Taste, why are some substances sweet, others sour, &c., 997
Taste, why is it most powerful after substances have been a little while in the mouth, 998
Taste, why if we put out the tongue and touch it with a nub of sugar, shall we perceive no taste, 999
Taste, why when we draw in the tongue do we then perceive the taste of the sugar, 1000
Taste, through what nerves are we made sensible of the contact of sugar with the tip of the tongue, 1001
Taste, why do connoisseurs of wines hold wine in their mouths a few seconds when judging of it, 1002
Taste, why do they also pass the fumes of the wine through their nostrils, 1003
Tea-pot, why does a bright metal one produce better tea than a black earthenware, 200
LESSON LXXI.
Tea-pot, if the earthenware one were set by the fire, why would it then make the best tea, 201
Tea, what is it, 1192
Tea, where is it cultivated, 1225
Tears, what is the cause of, 977
Temperature, why do some articles feel colder than others, 138
Temperature, why does it feel warmer after a frost has set in, 163
Tendons, what are they, 939
Tendons, why are they used to attach the muscles to the bones, 940
Teneriffe, what are the botanical regions of the Peak of, 1241
Thaumatrope, why do the figures on appear to dance, 869
Thaw, why is it colder when a thaw takes place, 164
Thermometer, what is the, 709
Thermometer, why does it indicate degrees of heat, 710
Thermometer, why are there Reaumur's and Fahrenheit's, 711
Thermometer and barometer, what is the difference, 712
Thermometer, in what season of the year does it vary most, 715
Thunder, what is it, 614
Thunder-peal, why is it sometimes loud and continuous, 616
LESSON LXXII.
Thunder-peal, why is it sometimes broken and unequal, 617
Thunder-peal, why is it sometimes a low, grumbling noise, 618
Thunder-peal, why does it sometimes follow immediately after the flash of lightning, 620
Thunder, through what distance will the sound travel, 621
Thunderbolt, what is a, 628
Tinder-box, the history of a, 340
Toasting-fork, why has it a wooden handle, 124
Tops, why do they stand erect while they spin, but fall when they stop, 814
Tops, why do they "sleep", 816
Tops, why do they cease to spin, 817
Touch, in what part of the body is the sense of most perfect, 1005
Toxicologists, what are they, 61
Trap and ball, why is the ball propelled upward, when the trigger is struck, 866
Trees, what are the estimated ages of, 1214
Trees, what are the northern limits of, 1237
Trees, why are they covered