Sleep elongates the body, 423 body feels not in, 425 dreams in, 424 ears hear not in, 423 eyes see not in, 423 mind wills not in, 424 tongue tastes not in, 423 Sleet, 332 Slit chestnuts, 105 Smelling salts, 426 SMELLS in wet weather, 152 of church-yards, 283 of putrefying bodies, 284 SMOKE, 39, 59 curls, 59 falls, 152 of fresh coals, 39 lamps diminished, 83 by a glass, 83 rises, 110 useful in cooking, 201 Smoky chimneys, 59 _See chimney._ Smoke-jacks, 112 SNOW, 331 arrests sound, 413 bad conductor, 333 cause of, 331 falls in winter, 332 not in summer, 334 like wool, 175 nourishes the earth, 333 on mountains, 334 soon melts beneath a hedge or wall, 206 use of, 332 warm, 332, 333 white, 334, 402 Snow and salt cold, 31, 357 Soap, 344 cleansing, 344 hard, soft, 344 yellow, 344 Soap-bubbles, 348, 398 change colour, 399 Soapy water bubbles, 348 Soda water, 268, 269 Sodium, 262 decomposes water, 262 Soft soap, 344 Solids, 112 Soot in summer, 71 on ceilings, 71 Sooty kettles, 186 SOUND, 409 affected by frost, 414 heat, 414 arrested by wet, 413 velocity of, 410 diminished by rarity of air, 416 heard best by night, 414 inaudible on mountains, 147 South wind rainy, 303, 320 warm, 303 South-west wind rainy, 304 Sparks from a fire, 106 a flint, 97 a horse-shoe, 98 Spectacles, 389 black, 408 blue, 407 for aged, 390 near sights, 389 Split bells, 411 Sponge swells when wet, 339 SPONTANEOUS COMBUSTION, 56, 57, 58, 85 Spoons become dull, 26 in water, 387 retard boiling, 117 Speaking promotes hunger, 88 Spring best late, 307 water cool, 182 sparkles, 269 Springs prevent freezing, 356 Sprinkling to cool rooms, 159 Stagnant water, 347 full of worms, 347 Stale beer, &c., _see beer_, 275 Stars distance and size of, 383 invisible by day, 368 seem flat, 384 seen in a well, 368, 374 seen on mountains, 376 twinkle, 406 Starvation, 86 produces madness, 86 STEAM, 127 engines burst, 236 invisible, 116, 235 of a kettle, 236 why visible, 117 what becomes of it, 117 STEEL and flint, 97 rusts, 259 prevented, 259 Stillness before a storm, 146 Stirring cools broth, &c., 247 Stockings difficult to draw on when wet, 340 STONES broken by frost, 350 cold, 169 collect no dew, 208 snap in fire, 108 unfit for fuel, 43 STORMS, 146 direction of, 28 places of danger in, 12 safety in, 20