Combinations of different Metals and Chlorine. 187 
a fine crystalline appearance ; the form of the crystals was 
apparently the octahedron. This deposition seems to be merely 
sulphur with a little of the fuming liquor between the inter- 
stices of the crystals, for the crystals bear washing, and be- 
come tasteless superficially, but remain still acid internally, 
where the water has not penetrated. 
It likewise dissolves resin. That which was called rosin 
was the subject of experiment. The solution was of a blueish 
green colour; but when gently heated it became brown, and 
remained so on cooling. The portion of resin the fuming 
liquor is capable of taking up, is very considerable ; when the 
resin was added in excess, a viscid mixture was formed. The 
resinous solution was decomposed by water, and the resin was 
separated apparently unaltered mixed with white arsenic. 
The fuming liquor is capable of combining with oil of tur- 
pentine and with olive oil. When the mixture was made with 
either of these oils, there was a considerable elevation of tem- 
perature, and a homogeneous colourless fluid was in each 
instance obtained. 
In these and some other properties, the fuming liquor of 
arsenic is analogous to the fuming compounds of chlorine and 
sulphur, and chlorine and phosphorus ; these too, having the 
power of dissolving sulphur, and phosphorus, and resin, and 
of entering into union with the fixed and volatile oils. 
It is difficult to ascertain the proportion of the constituent 
parts of this compound by the ordinary modes of analysis, I 
have chosen therefore a synthetical method in preference ; 
and from repeated experiments I find that 2 grains of arsenic 
require for complete conversion into the fuming liquor, 4 cubic 
inches exactly of chlorine gas. 
B b 2 
