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2pi Anahjfis of the Air, 



means of fire and fermentation rai fed from ] 

 and abforbed by animal, vegetable and mi- 

 neral fubftances. 



That this air confifts of particles which are 

 in a very active ftate, repelling each other 

 with force, and thereby constituting the fame 

 kind of elaftick fluid with common air, is 

 plain from its railing' the Mercury in Expe- 

 riment 8 8 and 89, and from its continu-' 

 ing in that elaftick ftate for many months, 

 tho* cooled by fevere frofts 5 whereas watry 

 vapours, tho' they expand much with heat, 

 yet are found immediately to condenfe in- 

 to their firft dimenfions when cold. 



The air generated by fire was not, in 

 many inftances, fcparated without great vio- 

 lence from the fix'd bodies, in which it 

 was incorporated 5 as in the cafe of Nitre, 

 Tartar, Sal Tartar and Copperas: whence it 

 mould feem, that the air generated from 

 thefe Salts, may probably be very inftru- 

 mental in the union of Salts, as well as that 

 central, denfer and comparer particle of 

 earth, which Sir Ifaac Newton obferves, 

 docs by its attraction make the watry acid 

 flow round it, for compofing the particles of 



Salt. qu. j 1. lor fmce upon the diflfolution 

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