SULPHUR. 113 



= (1)43.79; (2)43.82; (3)43.77. In each experiment of 

 the latter series the water was determined by driving it off 

 at a red heat. It was proved that the chloride does not 

 undergo decomposition at this temperature, and the water 

 contents was found to vary no more than 0.0005 of the 

 total weight. In three more experiments the water was 

 determined, and the anhydrous salt analysed by Pelouze's 

 method giving (1) 43.77 ; (2) 43.74 ; (3) 43.76. Ag = 108 ; 

 CI = 35.5; 8 = 16. The chloride was prepared (1) from 

 the chemically pure chloride of commerce by precipitating 

 barium with sulphuric acid, separation of lime by precipi- 

 tation of the strontium chloride by HCl gas and washing 

 with chlorhydric acid. The purity was tested by the solu- 

 bility of a portion converted into sulphate. The chloride 

 was finally redissolved and precipitated with alcohol. (2) 

 was prepared from (1) by a repetition of the same process. 

 (3) was prepared from (2) by recrystallization. {Bibl. TJniv.^ 

 Arch, des Sciences, (2,) 1, 1858, 220.) 



J. Dumas : 87.52 (0 = 16). 



Determined from the mean of six experiments on the 

 analysis of strontium chloride with argentic nitrate. The 

 extreme difference was 0.14, CI = 35.5 ; Ag = 108. The 

 salt was purified by boiling with sulphuric acid, and pre- 

 cipitation with and recrystallization from chlorhydric acid. 

 These processes were in some cases several times repeated. 

 The pure salt was fused in a current of HCl gas. {AnnaL, 

 de Chim. et de Phys., (3,) 65, 1859, 129.) 



SULPHUR. 



Deville and Troost and others have determined the den- 

 sity of sulphur in the gaseous form. It corresponds to an 

 atomic weight of about 32. The specific heat of sulphur 

 also agrees moderately well with this value. [Gmelin-Kraut, 

 I. c. ; L. Meyer, I. c.) 



J. J. Berzelius; F. H. Wollaston : 32 {0 = 16); 

 200 (0= 100). 



According to Wollaston, Berzelius found that plumbic 

 sulphide was composed of 86.64 lead and 13.36 S. Hence 

 the value, for lead = 1295. [Phil. Trans., 104, 1814, 20.) 



