OBSERVATIONS. 
fixed vegetable alkali: the precipitate 
weighed fixteen grains, and refembled 
the precipitate of tin, mentioned (b), and 
was added to it. 
(d) This calx of tin was diflolved again 
in marine acid, and precipitated from 
it in a metallic form by a cylinder of 
zinc. The metallic precipitate, col¬ 
lected, wafhed, and melted in a fmall 
crucible, with fome tallow, gave a but¬ 
ton which weighed twenty grains. After 
having been flattened, and cut in pieces, 
it was digefted in nitrous acid, and 
when completely calcined, diluted with 
water, and filtred. The folution was 
then examined with phlogifticated alkali, 
and fome brown flocculi were precipi¬ 
tated ; a mark of the tin being flill 
mixed with a fmall portion of iron. 
(e) In order to render thefe experi¬ 
ments more fatisfaClory, fimilar ones were 
made with a pure kind of zinzwitter : 
but in thefe there was not the lead: mark 
#f the butyrum ftanni, and the corrofive 
fublimate-j 
i 
