5 "eae 
4 beg a 
et ices 
Be 
of separating Tin from Arsenic, &e. 49 
4 
insoluble in the acid, while at other times they are decomposed 
t 
liquid is saturated with the gas, the sulphids of arsenic and 
m 
Seg! thrown down. Then, as eal the whole should be al- 
owed to stand about half an hour in a warm place before fil- 
tering. Every trace of arsenic and antimony is precipitated, 
80 that in the filtrate from the sulphids neither of these metals 
