t 91 1 

 feem not to have their organization 

 compleated for the office to which 

 they are deitined, and therefore 

 they are not yet able to elaborate 

 fo much nor £o good dephlogiftica- 

 ted air as the old ones. The expe- 

 riment 122 and 123 feem to be de- 

 cifive in this refpect. 



S E G T I O N XXV. 



^though the diminution of the bulk of 

 nitrous air is believed to be an un- 

 quejlionable tejl of the goodnejs of 

 any air, yet, it muji be alloived, 

 that in jome kinds of airs this tejl 

 may faiL 



AFTER having tried a great 



variety of airs myfelf, and after 



H having 



