RESBAECIIES UPON THE CHEMICAL PROPERTIES OF GASES. 



199 



Accordingly, determinations of silver and of sulphur were made with the following 

 results : 



FOUND. CALCULATED FOR AgjS. 



(1) (2) 



Ag 91.15 90.95 87.06 



S 8.70 8.75 12.94 



99.85 



99.70 



100.00 



Hence the compound consisted of silver sulphide, with a small quantity of silver 

 thrown down by the carbon monoxide present in the gas. 



Yellow mercuric oxide forms an excellent means of separation of the two gases, 

 and, after the removal of the hydrogen sulphide by this I'eagent used in a dry state, 

 the production of a precipitate in ammonlacal cadmium chloride solution would indi- 

 cate that this cadmium sulphide has been caused by carbon oxysulphide. 



The presence of a little carbon monoxide in the CSO made from KCl^S and 

 sulphuric acid is liable to mislead in the reaction towards palladium chloride, causing 

 a black precipitate of palladium resembling the sulphide. 



METHYL HTDROSULPHIDE, (CHo) SH. 



This gas may be produced by several typical reactions : 



(1) When methyl chloride (bromide or iodide) i§ heated with KSH in alcoholic 

 solution, the reaction being 



CH3CI + KSH = KCl + CH3SH. 



Methyl chloride gas was conducted into a boiling alcoholic solution of KSH 

 contained in a tube of the shape here shown. 



The long limb of the tube (length, thirty inches) was connected with a reversed 



