M. Carius on the Absorption of various Gases in Alcohol 119 



but as chlorine forms a hydrate at 10° C, the coefficient was 

 only determined between 10° C. and 40° C. 



The chlorine was determined by mixing a measured quantity 

 of the solution with a solution of iodide of potassium, and esti- 

 mating the iodine set free. 



The absorption of sulphuretted hydrogen was made in a 

 similar manner, and the gas absorbed estimated by mixing the 

 solution with chloride of copper, and determining the sulphur 

 in the sulphide of copper precipitated. Schonfeld has also made 

 experiments on the absorption of mixtures of sulphurous acid 

 and carbonic acid, and of sulphurous acid and hydrogen, and 

 has found that the results obtained agreed well with the formulae 

 developed by Bunsen* for the absorption of gaseous mixtures. 



Cariust has made a series of experiments on the absorption 

 of various gases in alcohol, and has shown that the law of ab- 

 sorption is the same for this liquid. This is also the case with 

 mixtures of gases. Carius determined the absorbability of a 

 mixture of carbonic oxide and carbonic acid, of carbonic oxide 

 and marsh gas, of carbonic acid and hydrogen, of sulphurous 

 acid and hydrogen, and of a mixture of three gases, carbonic 

 oxide, marsh gas, and hydrogen. In all these cases the results 

 agreed with the numbers required by Bunsen's forraulje. 



The same chemist has also provedj that the law of absorption 

 is applicable in the case of ammonia. The determinations were 

 made by the chemical method ; the quantity of ammonia dis- 

 solved at a given temperature being estimated by a standard 

 solution of sulphuric acid. With a mixture of hydrogen and of 

 ammonia the law of absorption also prevails. 



Recent determinations of the atomic weight of antimony 

 made by Schneider and Rose, will render necessary a material 

 alteration in the number usually adopted. In Schneider's § ex- 

 periments, the material employed was a native sulphuret of 

 antimony, of an extraordinary degree of purity, which occurs at 

 Arnsberg. The only impurity it contains is about i per cent. 

 of quartz, which was always brought into calculation. The 

 mode of determination was by reducing it to the metallic state 

 and weighing it as such. The reduction was effected by heating 

 it in a difficultly fusible glass tube, and passing hydrogen over 

 it: the reduction takes place at a tem])eraturc at which only 

 the merest traces of sulphuret of antimony are volatilized, and 

 at which the glass is not melted. The sulphuret of antimony 

 volatilized was collected and estimated, but when the current 



* Phil. Ma<;. vol. ix. pp. IKi and 181. 



t Liebig's Annalen, July 185.5. J Ibiil. July 1856. 



^ Foggeodorff'fl Annalen, February and May, 1856. 



