Improvements in Science. 299 



thate is formed by neutralizing an alcoholic solution of 

 potash with bi-sulphuret of carbon. Zeise has analyzed 

 the acid and finds it to consist of 



Sulphur 



56-440 = 8- . . 4 atoms. 



Carbon. . 32-169=4-5 . . 6 



Hydrogen 



4-377 = -625 . . 5 



Xanthic acid. 



Oxygen. . 7-014 = 1" . • 1 



100- 14-125 



Its formula is, therefore, S 4 C 6 H 5 O. 



Xanthate of potash contains potash. . . 29-244 70-756 

 Xanthateofsoda „ soda . . . 21-Mb 7 » 4M 



Xanthate of barytes „ ^.//^Sg 

 Xanthate of lead „ oxide of lead 49 638 50 36. 



Xanthate of copper „ oxide of copper 38-0 6-/0 

 {Poggendorffs Ann. xxxv. 487.) 

 VI. Bromide of deuto-carbydrogen.-Kegnault formed this 

 compound which was previously known, by dropping bro- 

 mine into a current of olefiant gas. It is a colourless 

 liquid, with a sweet taste. Density 2- 164. It consists of 

 2 vols, carbon . -8333 . 1'5 

 2 ,, hydrogen. -1398 . *25 

 1 ,, bromine . 5-5555 . 10* 



6-5286 11-75 



The density of the vapour by experiment was 6-485. Its 



formula is O H* Br. . 



Iodide ofdeuto-carbydrogen.-The best method of obtain- 

 ing this compound, is to. pass olefiant gas into the bottom 

 of a matrass with along neck containing iodine at the 

 temperature of 131°. The iodine speedily melts, and yellow 

 needles appear in the neck of the vessel, which become 

 white by the action of the gas. In taking them up by 

 water holding in solution some ammonia, a crystalline sub- 

 stance is obtained, which when washed and dried in vacuum, 

 constitutes iodide of deuto-carbydrogen. By drying, it al- 

 ways becomes slightly yellow. It melts at 163* . Insoluble 

 in water Soluble in ether and alcohol . It decomposes so 

 easily that it is difficult to determine the density of its 

 vapour, but analysis shewed its composition to be, 



