46 M I N E R A L O G I G A 1 
be different from the next, which was of 
a greenifh colour, I defifted as foon as the 
precipitate began to fhew this greenifh 
colour. I collected the whitifh precipi¬ 
tate by a filtre, edulcorated an doffed it ; 
having diffolved it again in marine acid, 
I put into this folution a cylinder of 
zinc. The tin precipitated itfelf on the 
zinc in a metallic ftate, but was mixed 
with a portion of copper. This metal¬ 
lic precipitate was therefore diffolved 
again in marine acid, by which means 
the copper remained undiffolved, and the 
filtred folution containing the tin was now 
clear and colourlefs. Having put a cy¬ 
linder of zinc into it, the tin was imme¬ 
diately precipitated in metallic fhining 
flocculi, which when wafhed and dried 
weighed 48 grains, and when melted in 
a fmall crucible covered with charcoal 
formed globules. 
(c) The fecond half of the metallic fo¬ 
lution, which remained after the lepa- 
ration of the firft precipitate, was com¬ 
pletely 
