Parts of Water and of Dephlogijticated Air. . 995 
firft fet in motion by external heat. ‘* Phlogifticated air feems 
<< alfo to be another compofition of phlogifion and dephlopifti- 
‘cated air;’’ but in what proportions they are united, or by 
what means, 1s (ill unknown. It appears to me to be very 
probable, that fixed air contains a greater quantity of phlo- 
gifton than phlogifticated air does, becaufe it has a greater 
{pecific gravity, and becaufe it has more affinity with water. 
5. ** For many years I have entertained an opinion, that air 
4 
n 
was a modification of water, which was originally founded 
on the facts that in moft cafes, wherein air was actually 
«< made,” which fhould be diftinguifhed from thofe wherein it 
is only extricated from fubftances containing it in their pores, 
or otherwife united to them in the ftate of air, ** the fub- 
ow 
¢ 
«* ftances were fuch as were known to contain water as one of 
«their conftituent parts, yet no water was obtained in the 
’ except what was known to be only loofely con- 
“<< procefies,’ 
neéted with them, fuch as the water of the ecryitallization of 
” that the latent 
heat contained in {team diuminifhed in proportion as the fen- 
fible heat of the water from which it was produced increafed ; 
or, in other words, “ that the latent heat of fteam was lefs 
© when it was produced under a greater preffure, or ina more 
‘odenfe flate, and greater when it was produced under a lefs: 
‘“preffure, or in'a lefs denfe ftate; which led me to conclude, ’ 
falts. <* This opinion arofe from a difcovery, 
“< that when a’very great degree of heat was neceflary for the 
‘production of the fleam, the latent heat would be wholly 
‘changed into fenfible heat; and ‘that, in fuch cafes, the 
“ fteam itfelf might fuffer fome remarkable change. IT now 
ie abandon this opinion in: fo far as relates to the change of 
*“ water into air, as think that may be accounted for.on better 
| principles.” | 
5 G6, <i 
