COMBINATIONS OF OXIMURIATIC ACID AND METALS. 123 



sulphur with a little of the faming 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 j 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 

 sep.?rated, apparently unaltered, mixed with white arsenic. 



The faming 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 Analogous to 



arsenic is analogous to the fumino^ compounds of chlorine and '^hef"''»'"g 



, , , . , , , , . - , compounds of 



sulphur, and chloririe and phosphorus ; these two, having the sulphur and 



power of dissolving sulphur, and phosphorus, and resin, and phosphorus. 



of entering into union with the fixed and volatile oils. 



It is difficult to ascertain the proportion of the constituent Its component 

 parts of this compound by the ordinary modes of analysis, I P^^'*' 

 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. 



The experiments were thus conducted : the arsenic in one 

 piece was put into a small glass retort having a stop-cock ; the 

 retort was exhausted, and a known volume of chlorine gas was 

 admitted from a graduated receiver by means of other stop- 

 cocks ; and the absorption of chlorine, after the entire conver- 

 sion of the metal into the fuming liquor, was considered as the 

 proportion condensed by the arsenic. 



Now, since 100 cubic inches of chlorine gas weigh just 76 5 

 grains, 2 grains of arsenic combine with 3"06 grains of chlo- 

 rine, the weight of 4 cubic inches of the gas. Hence 100 of 

 the fuming liquor appear to consist of 



6048 



