Parts of Water and of Depblogifiscated Air. aa 
matter of fact, would not that earth be found after the decom- 
pofition of the air? 
_, Mr. ScHEELE has formed an Hadas rs on this fubject, in 
which he fuppofes heat to be compofed of dephlogifticated air 
united to phlogifton, and that this combination is fufficiently 
fubtile to pats through glafs veffels. He affirms, that the ni- 
trous and other acids, when in an ignited ftafe, attract the 
phlegifton from the heat, and fet the dephlogitticated air at h- 
berty ; but he does not feem to have been more fuccefsful than 
mytelf, i in explaining what becomes of the acid of nitre and 
phlogifton i in the cafe of the decompofition of nitre by heat. 
And fince we know, from the late experiments, that water is a 
compofition of air, or more properly, Aumor and phlogifton, his 
whole theory muft fall to the ground, unlefs that faét be other- 
wife accounted for, which it does not feem eafy to do. 
16. To return to the experiment of the deflagration of 
dephlogifticated and inflammable air, ‘it appears from the 
<< two. airs becoming red-hot on their union, that the quantity: 
e ¢ of heat contained in one or both of them, is much greater 
*¢ than that contained in {team ; becaufe, for the firft moments 
= after the explofion, the water depofited by the air remains in 
ac ‘ the form of fteam, and confequently retains the latent heat 
“ due to that modification of water. This matter may be eafily 
AS ‘ examined by firing t the mixture of dephlogifticated and inflam- 
ce mable air in a velfel immerfed in another veflel containing a 
ec given quantity of water of a known heat, and after the vefiel 
“¢ in which the deflagration i is performed is come to the fame 
4 temperature with the water in which it is immerfed, by ex- 
“ amining how much heat that water has gained, which being 
«¢ divided by the quantity of water produced by the decom- 
zs _pofition of the aur, will give the whole qua: ntity of elemen- 
, Voc ‘etary 
