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TRANSACTIONS 



O F T H E 



American Philosophical Society, ^6". 



N". I. 



Experiments and Obfervations relating to the Arialyfis of 

 Atmofpherical air, by the Rev. Dr. J. Priestley. 



Reed Feb.TT is at! efleiitial part of the antiphloglflic 

 5. 1796- X theory, that in all the cafes of what I have 

 called the phlogijlication of air there is fimply an abforp- 

 tion of the dephlogillicated air, or, as the advocates of 

 that theory term it, the oxygen contained in it, leaving 

 the phlogifticated part, which they call azote, as it 

 originally exifted in the atmofphere. Alfo, according 

 to the principles of this fyftem, a%ote is a fimple fub- 

 ftance, at leaft not hitherto analyfed into any other : 

 They therefore fuppofe that there is a determinate pro- 

 portion between the quantities of oxygen and azote in 

 every portion of atmofpherical air, and that all that has 

 hitherto been done has been to feparate them from one 

 another. This proportion they ftate to be twenty feven 

 parts of oxygen and 73 of azote, in 100 of atmofphe- 

 rical air. 



A But 



