E oe , 
feem not to have their organization 
compleated for the office to which 
they are deftined, and therefore 
they are not yet able to elaborate 
fo much nor fo good dephlogittica- 
ted air as the old ones. _ The expe- 
riment 122 and 1 23 feem to be de- 
cifive in this refpect. 
SECTION XXvV. 
Though the diminution of the bulk of 
nitrous air 15 believed to be an un- 
* gueftionable teft of the goodne/s of 
~@ny air, yet, it muft be allowed, 
that in fome kinds of airs this te 
may fail. 
AFTER having tried a great. 
variety of airs myfelf, and after 
H having 
