cn the Specific Gravities , See. of Saline Subfancts. 231? 
OF THE QUANTITY OF PHLOGISTON IN. * 
VITRIOLIC AIR. 
The method I purfued was this : 
iff, I found the quantity of nitrous air a given weight of 
copper afforded when diffolved in the dephlogifficated nitrous 
acid, and by that means how much phlogifton it parts with. 
adly, I found the quantity of copper which a given quantity 
of the dephlogifficated vitriolic acid could diffolve; and ob- 
ferved, that it could not diffolve the greateft quantity of cop- 
per without dephlogifticating a further quantity which it does 
not diffolve. 
3dly, I found how much it dephlogifticates what it thoroughly 
diffolves, and how much it dephlogifticates what it barely 
calcines. 
4thly, How much inflammable air a given quantity of cop- 
... * 
per affords when diffolved in the vitriolic acid to the greateft 
advantage. 
5thly, I deduct from the whole quantity of phlogifton ex- 
pelled by the vitriolic acid the quantity of it contained in the 
inflammable air ; the remainder (hews the quantity of it con- 
tained in the vitriolic air. 
The particulars were as follows : 
iff, 1 00 gr. of copper diffolved in the dephlogifficated ni- 
trous acid afforded me 67,5 cubic inches of nitrous air, which, 
according to the before mentioned calculation, contain 4,52 gr. 
of phlogiffon. 
2dly, 100 gr. of real vitriolic acid take up or diffolve 54,73 
of copper, and ico gr* of copper require about 182,714 gr. 
of 
