Anatyfis of the Air. 293 



of the conftituent parts of Salt by fire, it is 

 found, that upon feparating and volatilizing 

 the acid fpirit, the air particles do in great 

 abundance rufh forth from a fixt to a re- 

 pelling elaftick ftate 5 it muft needs be, that 

 thefe particles did in their fixt ftate ftrongly 

 attract the acid fpirits, as well as the ful- 

 phureous earthy parts of the Salt ; for the 

 moft ftrongly repelling and elaftick parti- 

 cles are obferved, in a fixt ftate, to be the 

 moft ftrongly attracting. 



But the watry acid, which when feparated 

 from Salt by the action of fire, makes a very 

 corrofive fuming fpirit, will not make elaf- 

 tick air, tho' its parts were put into a brisk 

 motion by fire in Exper. 75- And the event 

 was the fame with feveral other volatile 

 fubftances, as volatile Salt of Sal Ammoni- 

 ac, Camphire and Brandy, which tho' dL* 

 {tilled over with a confiderable heat , yet 

 generated no elaftick air, in Exper. 52, 61I 

 66. Whence 'tis plain, the acid vapours in 

 the air only float in it like the watry va- 

 pours 5 and when ftrongly attracted by the 

 elaftick particles of the air, they firmly ad- 

 here to them ? and make Salts, 



U a Thus 



