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opinion of the utmofl canfequence, 

 and throws a great deal of light 

 upon the nature of nitrous air, and 

 upon its wonderful property of de- 

 ftroying refpirable air; and it il- 

 luitrates his ingenious theory of this 

 quality, which, I hope, the author 

 will foon publifh, but which I have 

 no right either to claim or to an- 

 ticipate. 



In confequence of this obferva- 

 tion we need not be fo anxious 

 about the goodnefs of the nitrous 

 acid, nor about the ftrength of the 

 nitrous air. 



We have now already examined 

 eighteen different heads, from which 

 errors or differences in this import- 

 ant experiment may arife, which 

 may render the whole remit of the 

 teft fallacious and entirely uncertain. 

 N There 



