, se 7 
ance than thofe he made upon the 
various kinds of airs. 
The difcovery of that wonderful 
aerial fluid, which in purity and fit- 
nefs for refpiration fo far exceeds 
the beft atmofpheric air, that an ani- 
_mal may protract its life in it five 
times longer than in the beft com- 
mon air, excites fo much the greater 
admiration, as he found it firft in 
fuch bodies which by their nature 
-muit have been fufpected to conceal 
_tather within their fubitance gels- 
: ‘mercury Pe ret “precipitate. He 
has given to this air the very proper 
appellation of dephlogifiicated air, or 
air deprived of that inflammable 
‘ principle which is the chief i ingre- 
_ dient that renders our atmofpheric 
_ air more or lefS impure, and thus | 
more or lefg fit for refpiration, ie > 
ta Se “His 
