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352 Mr. Wart's Thoughts on the confituent — 
It is alfo worthy of enquiry, whether all the amazing quan= 
tity of heat let loofe in thefe experiments was contained in the 
dephlogifticated air; or whether the greateft portion of it was 
not contained in the phlogifton or inflammable air. If it was 
all contained in the dephlogifticated air, ‘“ the general rule is not 
‘¢ faét, that elafit fluids are enlarged in their dimenfions in propor= 
‘¢ tion to the quantity of heat they contain;” becaufe then, inflam- 
mable air, which is ten times the bulk of dephlogifticated air, 
muft be fuppofed to contain no heat at all; ‘* and it is known, 
** from fome experiments of my friend Dr. Bracx’s, and fome 
“¢ of my own, that the fteam of boiling water, whofe iatent 
‘*¢ and fenfible heat are only 1100", reckoning from 60°, or tem- 
‘* perate, is more than twice the bulk of an equal weight of 
‘* dephlogifticated air.” It feems, however, reafonable to fup= 
pofe, that the greater quantity of heat fhould be contained in 
the rarer fluid. 
It may be alledged, that in proportion to the quantity of 
phlogifton that is contained in any fluid, the quantity of heat 
isleffened. But if we reafon by analogy, the attraction of the 
particles of matter to one another in other cafes is increafed 
by phlogifton, and ** bodies are thereby rendered fpecifically 
¢¢ heavier; and we know of no other fubftance befides heat 
which can be fuppofed to feparate the particles of inflammable 
air, and to endow it with fo very great an elaftic power, and 
fo {mall a fpecific gravity. On the other hand, if a great 
quantity of elementary heat be allowed to be contained in in= 
flammable air, on account of its bulk, the fame reafoning can- 
not hold good in refpe& to the phlogifton of phofphorus, ful- 
phur, charcoal, &c. But all thefe fubftances contain other 
matters befides phlogifton and heat. The acids in the fulphur 
and 

