the Attractive Powers of Mineral Acids. 
6 } 
Specific gravity 
Gold 
] 9 
Mercury 
H 
Silver 
1 1,09 1 
Lead 
1 ! ’33 
Copper 
8,8 
Wifmuth 
9,6 
Cobalt 
7>7 
Iron 
?>7 
Regulus of arfenic 
8,3 1 
Zinc 
7> 2 4 
Nickel 
/ 
Tin 
7 > 
Regulus of antimony 
6,86 
Affinity of the calces 
to phlogifton. 
0,25 
- 
1041 
- 
0 » 1 47 
- 
612 
0,1 1 8 
- 
49 1 
m 
o>i 16 
- 
433 
- 
0,109 
- 
45 + 
m 
0,099 
41 2 
~ 
0,092 
- 
° 8 ^ 
- 
0,090 
375 
- 
0,089 
- 
37 ° 
- 
0,08 1 7 
- 
340 
- 
0,08 1 2 
- 
338 
- 
0,075 
- 
J 1 w 
- 
0,074 
- 
3°8 
Here we fee, that the calx of lead has a greater affinity to 
phlogifton than the calces of any of the imperfect metals, 
and hence its ufe in cuppellation ; for after it has loll; its own 
phlogifton, it extracts that of the bale metals, and thus pro- 
motes their calcination and vitrification. 
Though the numbers in the fecond column exprefs tolerably 
well the greater or leffer affinity of metallic calces to phlo- 
giftou, yet they have this inconvenience, that they are not 
homogenous with thofe that exprefs the affinities of acids to 
other bafes, which limits their ufe to a narrow compafs, they 
being, on that account, incomparable with thofe that exprefs 
the affinities of acids : I therefore endeavoured to find a coin- 
cidence between them in fome one inflance, in order to reduce . 
them to the fame ftandard, as will be feen in the next para- 
graph. 
K a 
Of 
