and the feeming Converfion of Water into Air. 40^ 
ounce meafures. I11 this cafe, however, much of the inflam- 
mable air went to the formation of the vitriolic acid air, the 
fmell of which was very perceivable in the courfe of the ex- 
periment. The copper that I made in this way was brittle, and 
therefore feemed not to be perfectly metalized ; but being fuzed 
with borax it became perfect copper, and, as I think, without 
any lofs of weight. 
Bifmutb abforbed inflammable air in the proportion of 185 
ounce meafures to the ounce. The calx I ufed was a precipi- 
tate from the folution of this metal in fpirit ot nitre. 
Iron I got from a precipitate of a folution of green vitriol by 
fait of tartar, moiftened with fpirit of nitre, and expofed to a 
red heat. This calx abforbed in the proportion of 890 ounce 
meafures of the inflammable air to an ounce of iron, which 
was in the form of a black powder ; but to all appearance as 
much attracted by the magnet as iron tilings. But it could not 
be expe&ed, that perfect iron, containing its full proportion ot 
phlogifton, fhould be produced in this manner, iince inflam- 
mable air may be expelled from perfect iron in this very 
procefs. 
Silver I evidently revived from a folution of it in fpirit of 
nitre precipitated by fait of tartar, and alio from luna ca nea. 
A quantity of this laft fubffance abforbed 23 ounce meafures of 
inflammable air ; but I could not get any calx of filver free 
from final 1 grains of the perfect metal, which was ealily diico- 
vered by a magnifier, and therefore I could not alceitain the 
quantity of inflammable air abforbed by it. 
Small grains of regulus cohalt I produced fiom zaflie, and 
inflammable air was ablorbed ; but I did not eltimate the 
quantity. 
Vol. LXXIII. H h h A quan- 
