Part Ii.--Air.

XVIII.--AIR Rust Tarnish

XIX.--CARBONIC ACID GAS Froth Effervescence Fermentation, &c.

XX.--CARBURETTED HYDROGEN GAS Fire damp Safety lamp

XXI.--PHOSPHURETTED HYDROGEN GAS Ignis fatuus Ghosts

XXII.--WIND

XXIII.--BAROMETER Ten special Rules

XXIV.--SNOW. HAIL. RAIN

XXV.--WATER

XXVI.--ICE Frost Freezing mixtures

XXVII.--LIGHT Reflection Telescopes Refraction Spectacles Rainbows Colour

XXVIII.--SOUND Ear trumpets Echoes

XXIX.--MISCELLANEOUS Attraction Anti-putrescents Sleep Dreams Glossary Index