222 Continuation of the Experiments and. Obfervations 
of phlogifticated and dephlogifticated air ; the mixture was 
diminished in the fame proportion as it contained dephlogifti- 
cated air, and no more, scheele, § 43. 
Phlogifticated air, therefore, is not the ufiial product of. 
common phlogiftic procefles ; but the phlogifticated refiduum 
that is found after fuch procefles mufl have pre-exifted, as that, 
evidently does which is found after the mixture of nitrons and 
very pure dephlogilticated air, for almoft the whole of this laft 
is turned into air which is abforbed by water, and precipitates, 
lime, as we have already feen, fo that no part of it is con-, 
verted into phlogifticated air, this being immifcible with water. 
Now common air is affected by nitrous air juft in the fame 
manner, and differs only in degree ; therefore the phlogifticated 
air, which is found after its phlogiftication in the ufuaPpro- 
ceftes, was not produced by thofe operations, but pre-exifted. 
Phlogifticated air confifts of fixed air fuper-faturated with 
phlogifton, as fulphur does of volatile vitriolic acid fuper- 
faturated with phlogifton; and as fulphur is not generally, 
formed when the vitriolic acid unites to phlogifton, but only, 
volatile vitriolic acid, fo neither is phlogifticated air each time 
that pure air unites to phlogifton, but rather fixed air, 1 lay, 
Juper-jaturated , becaufe it contains fuch a quantity of phlo- 
gifton as to be infoluble in water. Many experiments of Dr., 
priestley clearly point out this compofition. Thus that 
celebrated philofopher has found, that if phlogifticated air be. 
agitated in water, out of which its air had been boiled, and 
whole fur face is expofed to the atmofphere, it will be in great., 
meal'ure purified (juft as fulphur is decompofed by trituration 
in water), and if then it be pafled through lime-water tw r o or 
three times, it renders it turbid. 2 pe. 218. Hem then the 
excefs of phlogifton, by reafon of its repulfion from water, is 
» eafily' 
