242 Dr. Priestley’s Experiments, &c. 
meafures of inflammable air and one of dephlogiflicated ; 
whereas there was either no fixed air at all, or the flighted 
appearance of it imaginable, when I made ufe of inflammable 
air from malleable iron, extracted either by means of fleam or 
acids. 
The principal of thele experiments, as well as thofe in my 
former Papers on this fubjedt, will be found to confirm the 
fimilar ones of Mr. Cavendish ; but they prove the fource of 
the acid in the refults not to be what he imagined, viz. phlo- 
gifhcated air, but the union of the dephlogiflicated and in* 
flammable air ; and they alfo make it at leaft doubtful, whe- 
ther thefe two kinds of air compofe pure water. 
