Chemical Science. 149 



The following are some of the results obtained by this mode 

 of operation. Sulphuret of Barium. — White and light grey, 

 slightly aggregated, and composed of crystalline grains. It 

 dissolved completely in water, without colouring it, the solution 

 giving, with muriatic acid, sulphuretted hydrogen, without pro- 

 ducing aiiy turbidness. It was scarcely affected by heat alone ; 

 but detonated with nitre, and raised to a white heat, afterwards 

 diffused through water, and saturated with muriatic acid, it 

 was found that the fluid contained no sulphuric acid, and but a 

 very slight trace of barytes. Hence the re-conversion into sul- 

 phate had been complete. 120 parts of sulphate of baryta, in 

 becoming sulphuret, lost 34 parts. This sulphuret is composed 

 of 



Barium .... 100 

 Sulphur . . . 24.47 



Sulphuret of Strontium. — White, granulated, aggregated, and 

 friable; 20 parts sulphate lost 7.2 parts by reduction into sul- 

 phuret ; its composition is. 



Strontium . . . . 100 



Sulphur 36.6 



Sulphuret of Calcium. — White and opaque, retaining the form 

 of the gypsum used, soluble in water, &c., like the compound of 

 barium ; 20 parts of sulphate of lime from Puy, lost of water 

 and oxygen 9.24. The sulphuret is composed of 



Calcium 100 



Sulphur 78.3 



Sulphur ets of Potassium and Sodium. — Mammilated, crystal- 

 line, translucid, and of a fine flesh-red colour. These dissolved 

 in water, with great heat, are very diflacult to roast ; they do 

 not evolve sulphur, but slowly become sulphates. When they 

 have become mixed with charcoal in the crucible, they inflame 

 upon being moistened. Sulphuret of potassium consists of, 

 Potassium .... 100 

 Sulphur ..... 41.06 

 Sulphuret of sodium of, 



Sodium 100 



Sulphur 69.27 



Sulphuret of Maynesium. — 10 of sulphate of magnesia re- 

 cently calcined, gave 3.95, of a white friable residue, which, 

 L 2 



