_ Mr. Cavennisu’s Experiments of) Air. 523 
eply:a very flight one, or rather dithinution of tranfparency, 
when it was combined with’ dephlogif{ticated) air. This; how- 
ever, feemed not to be produced by fixed’ain;::asat appeared ins 
{tantly after the explofion, and did not imcreafe sony ftanding, 
and,!was -{pread uniformly through ‘the -liquor ; whereas-if:it 
had been owing:to fixed air, 1t would: havetaken up: fome’ {hort 
time before it appeared, and would have begum firft at the fur 
face, as was the; cafe in the abovementioned experiment’ with 
nitrous air. «What it was really owing ‘to! J cannot pretend 
today ; but ifi it did: proceed :from fixed air it: would thew that 
enly. an exceéflively; minute quantity was produced *. On -the 
Whole, thoughrityis:not improbable that fixed air may be gene~ 
fated in fome:chymical procefies;, yet it: feems>certain that it/:is 
not the general.effe& of phlogifiscating air, and that the dimi- 
nution-of-common air is by no means owing fo athe: generation 
endeparation.of fixed: air frombitaooig sly botrotlinols 41 
As there feemed great. reafon|to think, aie Dr. Rishiaga $ 
eipeiiiments) that the nutrous;andavitriolic agids, were; conver- 
tibleanto;dephiogifticated air, tmed whether,-the ,dephlogifi- 
cated «part of -coimmon)-ait/ «ight not, by, phlogiftication,. be 
changed intornitrous! or; vitriolic: acid... For this purpofe f-im-= 
preguated fome milk of lime with the cen of burning fulph ur, 
byisputting- Aditle: of; itsinto alarge glafs regeiver, and burning, 
fiphur thereity); staking icate;to; keep the mouth ofthe receiver 
fopt till-the fumes were} alli abforbed ; after which--the “aar Of 
the receiver .was; changed;-dnd Imore) {ulphur, burnt, in} it.as 
before, and the procefs repeated till. 122 grains of fulphur; were 
confumed.» |The milk of lime was then filtered and, évaporated, 
but cit yielded ho!-nitrous (alt, nor any other fubftance-except 
felemite;' fo that no fenfible. quantity. of; the! air, was, changed 
o* Dr. Prisraey alfo found no fixed.airtg be. producedcby the explofion(jof; ing 
fétimable‘and common air, Vol. V, p. 124. 
zi Riz into 
