VI. 



PART II. AIR. 



PAGE 



XVIII. AIR ...... 240 



Rust, 257. Tarnish, 259. 

 XIX. CARBONIC ACID GAS . . . 264 



Froth. Effervescence. Fermentation, &c. 

 XX. CARBURETTED HYDROGEN GAS . . 279 



Fire damp, 280. Safety lamp, 281. 

 XXI. PHOSPHURETTED HYDROGEN GAS . 283 

 Ignis fatuus, 285. Ghosts, 286. 



XXII. WIND 287 



XXIII. BAROMETER . . . . 317 



Ten special Rules, 319. 

 XXIV. SNOW. HAIL. RAIN . .331 



XXV. WATER 342 



XXVI. ICE .... .349 



Frost, 357. Freezing mixtures, 360. 

 XXVII. LIGHT . . 303 



Reflection. Telescopes. Refraction, 886. 

 Spectacles, 389. Rainbows, 394. Colour, 399. 



XXVIII. SOUND 409 



Ear trumpets, 415. Echoes, 416. 

 XXIX. MISCELLANEOUS . . . 419 



Attraction. Anti-putrescents. Sleep. Dreams, 

 Glossary, 426. Index, 427. 



