SULPHURETS. 189 



was colourless. Muriatic acid disengaged sul- 

 phuretted hydrogen from the solution. The sul- 

 plmret of barium is not altered by roasting, but 

 when detonated with nitre it is converted into 

 sulphate of barytes.* Hence, it is obviously a 

 protosulphuret of barium composed of 



I atom barium . . 8'75 



1 atom sulphur . . 2 



10-75 



In Berthier's process there was a slight loss of the 

 sulphur. Hence, he obtained a compound of 



Barium . . . 8-75 



Sulphur . 1-95 



6. Sulphuret of strontium. This sulphuret strontium, 

 was obtained by Berthier in a similar way ; its 

 properties agree nearly with those of sulphuret 

 of calcium. It was a protosulphuret composed 

 of 



1 atom strontium . . 5-5 

 1 atom sulphur . . 2 



7-5 



In Berthier's process a little of the sulphur had 

 escaped, for he obtained a compound of 



Strontium ... 5-5 



Sulphur . . . 195 



* Ann. de Chiin. et de Phys. XXII. 232. 



