ON THE PROCESS FOR THE DETECTION OE ARSENIC. 113 
sulphuretted hydrogen, this will produce with the arsenic a 
pulverulent deposit of a golden-yellow, and with the antimony 
an orange-yellow precipitate ; the first disappears on the 
addition of some drops of ammonia, which is not the case with 
the other." 
From this he concludes, 
" 1. That arseniuretted hydrogen may easily be distin- 
guished from antimoniuretted hydrogen, and that the former, 
whether mixed with a large quantity of hydrogen or of air, 
is decomposed by chlorine so as to produce metallic films, 
which is not the case with antimoniuretted hydrogen. 
" 2. Finally, that the films formed upon the porcelain by 
the combustion of arseniuretted or antimoniuretted hydrogen, 
when dissolved in aqua regia, can be distinguished, without 
fear of error, by means of sulphuretted hydrogen." 
R. B. 
VOL, IV. — NO. II. 
15 
