TREES barked by lightning, 29 collect dew, 208 covered with bass, &c., 359 look more distant in a fog, 148 promote warmth, 161 purify air, 253 shade of, cool, 183 Tumblers, _see glasses_ Twilight, 399 Two eyes, 368 see single, 369 Unslit chestnuts, 104 Use of barometers, 317 clouds, 137 smoke in cooking, 201 snow, 332 Valley chimneys smoke, 66 VAPORIZATION, 126, 127 Vapour of a carriage, 214 of a room, 212 of sea not salt, 163 Vats fatal, 265 Vegetable and animal life co-dependent, 244 Vegetables collect dew, 208 cool the blood, 92 Velocity of clouds, 314 light, 364 sound, 410 wind, 313 Vent peg, 273, 274 VENTILATION, 315 sought by the well-fed, 94 not by the ill-fed, 94 Verdigris, 426 Vertical sun, 293 Vestry chimneys smoke, 66 Violets blue, 402 Walls wet in winter, 216 Want connected with dirt, 93 Warm clothes, 187 some things more than others, 165 Wash-hand-basin, 171 Washing, water for, 275 should not be hard, 343 WATER, 38, 342 and lime, 30 and sulphuric acid, 30 ashes soften, 345 bad conductor, 171, 234 boiling, 119, 232, 234 bubbles, 114, 233 rattles, 116 runs over, 115, 233 sings, 233 cleans dirty linen, 344 cold, 177 converted to steam, 127, 343 cools slowly, 225 deep, freezes slowly, 356 dried up in summer, 162 expands by frost, 351 by heat, 351 extinguishes fire, 54, 107 flat when boiled, 275 fluid, 342 flowing, pure, 347 for washing, 275 freezes at the surface, 253 hard, 343 unfit for washing, 343 how preserved cool, 191, 202 hot, 191 heated, 232 intenses fire, 54 mixed with salt, boils slower, 119 not heated above boiling, 235 of a spring cool, 182 purified, 72 purifies bins, &c., 267 salt, bad for washing, 343 shallow, freezes fastest, 355 slackens flame, 55 soft, 344 best for washing, 345 sparkles, 269 stagnant, 347 full of worms, 347 stale, 275 swells with boiling, 114 will not bubble without soap, 348 warm when frozen, 354 Water pipes broken by frost, 351 covered with litter, 359 Watering plants by the saucer, 420 streets, 159 Waves, 312 Wax, 74 Wax candles need no snuffing, 81 Weather affected by tempests, 326 prognostics of, 137 told by barometer, 318 rules, 319 Weather toys, 339, 340 Well, moon seen in, 374 stars seen in, 368 sun not seen in, 373 West Wind promotes dew, 218 rainy, 304, 320