ON ARSE NIU RETTED HYDROGEN. 
153 
This diners from the precipitate by phosphorous only in 
the latter containing three atoms of water, while the former 
is anhydrous. These precipitates likewise differ in their 
mode of reaction under the influence of heat ; the chloro- 
phosphuret of mercury contains such a quantity of water, that 
its hydrogen changes all the chlorine into hydrochloric acid, 
and its oxygen all the phosphorus into phosphoric acid. The 
chloro-arseniuret of mercury, on the contrary, yields under 
the same circumstances no gaseous product ; it sublimes with- 
out residue, being decomposed into proto-chloride of mercu- 
ry and metallic arsenic. There is sublimed at the same time 
a small quantity of a reddish substance, which consists of mer- 
cury, chlorine and arsenic, and is nothing else but the sub- 
stance sublimed without decomposition. Sometimes the sub- 
limate is accompanied by a small quantity of metallic mercury. 
The analysis of the arsenical precipitate and the action 
which it exerts on water fully confirm the composition of ar- 
seniuretted hydrogen, as admitted by MM. Dumas and Sou- 
beiran. 
The precipitate produced by antimoniurctted hydrogen in 
deuto-chloride of mercury, differs from the preceding in its 
composition ; from which we may conclude that antimoniu- 
retted hydrogen does not possesss a composition analogous to 
that of arseniuretted and phosphuretted hydrogen*. 
Jinn, de Chim. et de Phys, 
