CONTENTS. 



CHAP. IV. page 385. 

 Of Carbonic Acid Gas ; Fixed or Fixable Air. 

 fhe Bajis of this Air is the elementary Matter of Charcoal. Combined 

 <with Oxygen Modes of -producing it. Fermentation* Quantity 

 contained in different Kinds of Wines. Choak Damp. Properties of 

 Fixed Air. Great fpecific Gravity. May be poured out of a Vejftl 

 like Water. Re/tfts Putrefaction. 



CHAP. V.* page 391. 

 Inflammable Air or Hydrogen Gas, 



This Gas forms the Bajis of Water. Proportion of Hydrogen and Oxy- 

 gen luhich enter into the Composition of Water. ^Modes of procuring 

 inflammable Air.~Ignes Fatui.*Fire Damp in Mines Lighteft of 

 all Fluids." Remarkable Properties. -Vfe in Air BaUoons t <-~C.uriou$ 

 aerial Fireivor&s. 



CHAP. VI. page 397, 

 Nitrous Air or Gas. 



Nature of this Fluid. Ho-iv produced. /// Properties. Rejifts Putre? 

 fation.-^-Abforbs and condenfes pure Air, 'The Eudiometer. 



CHAP. VII. page 403. 



Of Hepatic Gas. 



Nature of this Gas. 'Means of producing it. Its Properties. A chief 

 Conjiituent of Sulphureous Mineral Waters. -Turns Metals black. 

 How decompofed, &c. 



CHAP. VIII. page 404. 

 Of Atmofpheric Air. 



Atmofbhere compofed chiefly of Two Kinds of Air. Contains alfo Fixed 

 Air, and occafeonally other Subftances. Effefls of this Mixture on 

 Metals and Purple Dyes. Means of purifying the Atmojphere from 

 Fixed Air, and putrid Vapours. ---Effects of Moifture contained in 

 Air. The Hydrometer. Cold in the higher Regions of the Atmn- 

 fphere.'Caufe. 



CHAP. IX. page 416. 



Of the Weight, Elasticity, and other General Properties of the Air, 

 General Properties of Air. Caufe of its Elafticity* Opinions of the 

 Antients. Torricellian Experiment. Barometer. The Air Pump. 

 Weight and fpecif.c Gravity of Air.- Immenfe PreJJure of the 

 Almofphere* CompreJJtbility of Air. -Cupping GlaJJes. EffecJs of 

 the Air's Elajiicity. Air Guns, &c. Motion of Particles in Bo- 

 fties. Nature of the Atmofphere, "Its probable Height, 



CHAP. 



