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Analyfis of the Air. 



6, 





which I made by means of thcfe infiru- 

 ments, which I have here at firft defcribed, 

 to avoid the frequent repetition of a defcrip- 

 tion of 'em. It is confonant to the right 

 method of philofophifing, firft, to analize 

 the Subject, whofe nature and propetties we 

 intend to make any researches into, by a 

 regular and numerous feries of Experiments : 

 And then by laying the event of thofc Ex- 

 periments before us in one view, thereby to 

 fee what light their united and concurring 

 evidence will give us. How rational this 

 method is, the fequel of thefe Experiments 



will fhew. 



The illuftrious Sir Ifaac Newton (query 

 ?ift of his Opticks) obferves, that "true 

 permanent Air arifes by fermentation or 

 heat, from thofe bodies which the chy- 

 mifts call fixed, whofe particles adhere by 

 " a ftrong attraction, and are not therefore 

 " Separated and rarificd without fermenta- 

 " tion. Thofe particles receding from one 

 another with the greateft repulfive force, 

 and being mod difficultly brought toge- 

 ther, which upon contact were moft ftrong- 

 ly united. And query 30. denfe bodies by 



fermentation rarify into Several forts of 



M i " Air, 



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