Paris of Water and of Dephlogifticated Abr. 349 
nitre ‘can. produce one half of its weight of dephlogifticated-air. 
When the nitre and fulphur are kindled, the dephlogifticated 
air of the nitre unites with the phlogifton of the fulphur, and_ 
fets its acid free, which immediately unites to the alkali of the 
nitre, and produces vitriolated tartar. The dephlogifticated air, 
united to the phlogifton, is turned into water, part of which is 
abforbed by the vitriolated tartar, and part is diffipated in’ the 
form of vapours, or unites to the nitrous air, or other alr, pro- 
duced in the proce(s. , 
- As half an ounce of dephlogifticated air is, in this pkodetes 
united by inflammation toa quantity of phlogifton fufficient to 
faturate it, and no fixed air is produced, it fhould melt:a quan- 
tity of ice equal to the half of what was melted by the com- 
bination of an ounce of air with phlogifton in burning :phof- 
| phorus; that is, it fhould melt 34,317 ounces of ice; and we 
find, by Meff. Lavoisier and De La PLAcek’s experiment, 
that it actually melted 32 ounces of ice: the {mall difference 
“may be accounted for by fuppofing, that the heat produced by 
the combuftion might not be quite fo great as that Dr. 
PrigsTLEY employed in his experiment; or that the nitre 
might be lef pure, and confequently not fo much air formed. 
The two facts, however, agree near enough to permit us to 
conclude, that dephlogifticated air, in uniting to the phlogifion 
of fulphur, produces as much heat as it does in ae with the 
phlogifton of phofphorus. 
17s According to Dr. PRiesTLEY’s sapere dephlogif- 
ticated air unites compleatly with about twice its bulk of the 
inflammable air from metals. The inflammable air being fup- 
\pofed to be wholly phlogifton, and being =; of the weight 
‘ofan equal bulk of dephlogifticated air, and being double in 
‘quantity, will be a of the weight of the dephlogifticated air 
pe 

