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