the Attractive Powers of Mineral Acids. 61 
grs .Jljould give. I repeated the experiment three times with 
the fame fuccefs. I attempted getting more air from the reli- 
duum left by a gentle evaporation, but though frefti fpirit of 
nitre grew red with it, the quantity of air was quite inconft- 
derable. 
Now this quantity of nitrous air contains 6, §6 grs. of phlo- 
gifton, according to the calculation to be feen in my former 
paper; and hence 1 conclude, that ioo grs. of regulus of arl'e- 
nic contains 6,86 grs. of phlogifton. This regulus was made 
by Mr. wolfe, and perfectly bright. 
Hence the relative proportion of phlogifton in metals being,, 
as found by Mr. bergman, and fet forth in the firft column i 
of the following table, the ahfolute quantity will be as fhewn 
in the fecond column. 
Relative quantity of phlogifton. Abfolute quantity* 
Gold 
394 
24,82 
Copper 
312 
19,65 
Cobalt 
to 
0 
1 
1 
17,01 
Iron 
23 3 
14,67 
Zinc 
182 
11,46 
Nickel 
156 
9,82 
Regulus of antimony 
120 
7>5 6 
Tin 
114 
7,18 
Regulus of arfenie 
►■H 
0 
NO 
1 
1 
6,86 
Silver 
IOO 
6,30 
Mercury 
74 
4,56 
Wifmuth 
57 
3’59 
Lead 
43 
2,70 
This point being, as I conceived, of fome importance, I en- 
deavoured to afeertain it ftiil further by other experiments ; and 
as 
