ON THE PROCESS FOR THE DETECTION OP ARSENIC. Ill 
a large quantity of the oxide of antimony produces a whitish 
green precipitate, which might easily be mistaken for Scheeles 
green. The two metals may, however, be distinguished by 
adding a drop of nitric acid to the crusts; they will imme- 
diately dissolve, and on evaporating to dryness, a white powder 
is left in each instance. A few drops of dilute solution of the 
nitrate of silver being now added, and the whole exposed to 
the fumes arising from a stopper moistened with ammonia, 
the antimonial solution will be observed to deposit a dense 
white precipitate, whereas that from arsenic will give the well 
known canary-yellow flocculi." 
The antimoniated hydrogen, when inflamed, yields results 
equal in delicacy to those produced by arseniuretted hydrogen; 
for "the gas arising from one grain of tartar emetic, or any 
other salt or oxide of antimony with a little diluted sulphuric 
acid and zinc, will furnish abundance of metallic crusts; indeed,, 
a single drop of the common wine of antimony will produce a 
distinct film." 
Considering the liability of tartarized antimony being ad- 
ministered to produce vomiting either in cases where poison 
has been taken or is suspected, the above discovery becomes 
of great interest, and it is important for us to know the dif- 
ferent habitudes of these gases to be enabled to discriminate 
between them with greater certainty. The following obser- 
vations of M. Vogel de Munich, {Journal de Pharmacie, 
Mars, 1838,) will afford considerable aid on this point: 
" When we direct the flame of this gas (antimoniuretted 
hydrogen) upon a plate of porcelain, this becomes covered 
with metallic films, in the same way as with arseniuretted 
hydrogen; but if we burn the antimoniuretted hydrogen in a 
bell-glass in contact with the air, not the smallest trace of 
antimony is deposited upon the sides of the vessel, a circum- 
stance which happens in a very decisive manner with arse- 
niuretted hydrogen; although the quantity of arsenic may be 
very small in a large quantity of hydrogen, the deposit of 
arsenic will yet be very sensible. Chlorine gas mixed with 
