2.32 Continuation of the Experiments and Obfervations 
of real vitriolic acid to difldve them. Again, too :gr. of cop- 
per, when diffolved m tire vitriolic acid, retain only much 
phlogifton as is contained in three cubic inches of nitrous .air, 
that is, 0,2 of a grain.; therefore, fince i-oo gr. of copper 
give out 4,52 of phlogifton, the vitriolic acid ft rips it of 4,52 
-0,2, that is, 4,32 gr. of phlogifton. 
3dly, To difl'olve 70 gr.. of copper in the vitriolic acid, to 
the greateft advantage, 20 more muft be (lightly dephlogiftf- 
cated ; therefore., to diftol.ve 10.0 gr. of copper in this acid, 
28,6 more muft he (lightly dcphlogifticated. 5 .grs, ot this 
(lightly dephlogifticated calx afforded 4 cubic inches of nitrous 
air ; therefore, 28,6 would afford -14,3, which contain 0,958 
gr. of phlogifton ; but 28,6 gr. of copper., before any deplilo- 
gifti cation, contain 1,292 gr. of phlogifton ; therefoi e, they 
lofe .by this (light dephlogiftica-tion 0,344 of a grain of phlo- 
gifton, Hence, when 100 gr. of copper .are diflolved in the 
vitriolic acid, the quantity of phlogifton expelled is 4 > 3 2 + 
0,34 = 4,66 gr, 
4thly, The quantity of inflammable air afforded by the moft 
advantageous folution of 100 gr. of copper in the vitriolic acid 
is 1 1 cubic inches, which amount to 0,385 of a grain of phlo- 
gifton 
5thly, The folution of 100 gr. of copper in the vitriolic acid 
afforded over mercury 75,71 cubic inches of air; but of this 
only 1 1 cubic inches were inflammable air, the remainder 
therefore was vitriolic acid air, amounting to 64,71 cubic 
inches. 
6thly, Then the whole quantity of phlogifton expelled during 
the folution of 100 gr. of copper in the vitriolic acid is 4,66 
gr. ; of .this inflammable aircontains but 0,385 of a grain : the 
remainder therefore, which confifts of 4^75 S r * milft be con ~ 
r tained 
