relating to Phtogifion, &c. Part lit. ig 
bulk were very nearly the fame, lefs than when the original 
inflammable air was ufed, becaufe all the impurities in the 
whole quantity were retained in a fmall refiduum, the metals 
having imbibed nothing but pure phlogiftom Alfo the in- 
flammable air had been long confined by water, in confequence 
of which it is always altered more or lefs. The particulars of 
the procefles were as follows : 
The finery cinder was revived in 7 oz. m. of inflammable 
air, which was thereby reduced to ij oz. m. ; and an oz. 
m. of this refiduum being fired together with an equal Quan- 
tity of dephlogifticated air, not very pure, the diminution of 
both was to 28 divifions of a tube, of which 30 was one oz. 
m. when with equal quantities of the fame dephlogifticated 
and the original inflammable air the diminution was to 18. 
The mafficot was reduced in 8 oz. m. of inflammable air 
till it was reduced to 1 J oz. m. ; and after the procefs with 
the dephlogifticated air, the diminution was to 29, when with 
the original inflammable air it was to 17}. 
In both the refiduums, after the explofion, there was a 
flight appearance of fixed ah\ though none could be perceived 
before the explofion ; but in both cafes it was fo flight that it 
could not have been perceived by the diminution of its bulk. 
But fince both fixed air and nitrous acid are produced from the 
fame materials in different circumftances, it cannot be thought 
extraordinary if, in fome cafes, both fliould be produced at the 
fame time. 
M. Lavoisier and his affociates farther obferve, p. 300. 
with refpedl to my experiments, that 66 when a calx is revived 
44 in inflammable air, more water is found in the veifel than the 
44 weight of inflammable air that difappears, fo that it could 
46 not have been contained in that air.” They only refer to 
D 2 my 
