MIST arrests sound, 414 black, 144 cause of, 224 differs from cloud, 128 dew, 222 fog, 227 seems to rise, 222 vanishes at sunrise, 227 white, 144 Mixing not combining, 25 Money hot in a pocket, 168 Monsoon, 300 Months, driest, 328 wettest, 329 MOON, distance and size, 383 largest at horizon, 149, 378 reflected in water, 376 in a well, 374 seems flat, 383 larger than stars, 383 Moonlight makes plants grow, 220 taints meat, 220 MORNING breeze, 308 gray, 140 rainbow, 141 red, 139, 399 streaks, 132 MORTAR, 278 adhesive, 279 crumbles, 358 Motes in a sun-beam, 248 Mould hardened by sun, 163 Mouldiness prevented, 422 Mountains cold, 100, 195 collect rain, 338 famous for echoes, 417 impede respiration, 255 noiseless, 416 Muriate of soda, 426 Musical instruments, 411 flat, 412 Nails for matches, 96 Naves fitted on hot, 122 Near-sight, 388, 391 spectacles for, 389 Negative electricity, 66 Negroes, why black, 190 with black eyes, 190 New kettles boil slowly, 186 Night allays hunger, 88 exhilarating, 144 oppressive, 144 produces cold, 89 rainbow at, 141 Nimbus clouds, 137 Nitrate of silver, 426 Nitric acid, 28, 426 Nitrogen, 36 North wind cold, 302 dry, 303 North-east wind dry, 305, 320 November rainy, 308, 338 Oak attracts lightning, 257 Old people far-sighted, 390 hold objects at a distance, 392 lose their sensation, thought, volition, 425 lose their power of walking, 425 spectacles for, 391 Oil, 74 linseed, 119 of turpentine, 119 of vitriol, 426 One pot will not boil in another, 118 how to make it boil, 118 Oxalic acid, 426 copper, 259 iron, 257 OXIDE of lead, 259, 426 platinum, 261 potassium, 262 silver, 260 sodium, 262 Oxygen, 34 of air, 97 its use, 240 supports combustion, 240 sustains life, 240 Out-of-door work produces hunger, 89 Owls prowl at night, 367 see in the dark, 367 sleep all day, 367 Paleness, 243 Palmer's candles, 80 Paper burns, 41 not always, 44, 53 extinguishers, 79 puckers from wet, 339 used for kindling, 41 Papillæ, 425 Paris, plaster of, 426 rain of, 340 Parlours smell of smoke in summer, 71 Partition walls to arrest sound, 415 Pea-soup fog, 225 PERCUSSION, 95 Perspiration, 89 Petals, 402 Petrels, 154 Phosphate of lime, 284 Phosphorus, 283, 284 PHOSPHURETTED HYDROGEN GAS, 283 Piano-forte, 412 Pickle tested, 361 Pie with a cup, 120 full of juice, 121 Pin puts a candle out, 81