Comlinaimis of different Metals and Chlorine, ^c. 173 



exact proportion of sulphur in both these sulphurets, for 

 the sake of comparison with the combinations of tin and 

 chlorine. 



100 grains of tin in a finely divided state, as precipitated 

 from the muriat of this metal by zinc, were heated in a 

 glass tube inlimately mixed with sulphury the combination 

 of the two was accompanied with vivid ignition, the sul- 

 phuret formed wei'^tied 127"3 grains, and broken, it ap- 

 peared pertectlv homogeneous ; it was pounded, and again 

 heated with sulphur; but the excess of sulphur being ex- 

 pelled, the fused sulphuret had not increased in weight. 

 The second time I made this experiment, I obtained the 

 same result. 



Fifty grains of aurum musivum, purified from mixed sul- 

 phur by exposure in a close ve sel to a dull red heat, were 

 decomposed by a bright red heat in a small green glass tube 

 nicely weighed, and having only a very small orifice; the 

 loss of sulphur, by conversion into the gray sulphuret, was 

 equal to 9"3 grains. Hence, as 40*7 grains of gray sul- 

 phuret contain 8'72 grains of sulphur, 50 grains of aurum 

 musivum appear to contain !8'02 grams. 



The ratio in which sulphur combines with bodies is to 

 that in which oxygen and in which chlorine combine, as 

 15 to 7'5 and 33-6. This appears from the proportions of 

 the constituent parts of sulphuretted hydrnrren and sul- 

 phureous acid gas, for I have found 100 cubic inches of the 

 former to weigh 36-64 grains, and 100 of the latter 68*44 

 grains. In the comparison, therefore, i^etween the sul- 

 phurets of tin and the combinations of this metal and 

 chlorine, 15 by weight of suiphiir are equivalent to 33-6 of 

 chlorine. And the tin being as 5b, it appears from the 

 analysis of the gray sulphuret and stanriane, that the sul- 

 phur is to the chlorine as 15 exactly to 33-4; and from the 

 analysis of the other two compounds, aurum musivum and 

 the liquor of Libavius, as 15-3 to 33*5, or as 31 to 67. 



The proportions of sulphur in the \.\\o sulphurcls of iron 

 do not accord with the proportions of oxvgcn in the oxides, 

 or of chlorine in the chlorine combinations; but 1 am vet 

 ignorant of the cause of this difllrence. 



100 grains of lead, heated with sulphur in a i»Iass tube, 

 afforded, in two trials, 113-3 grains of fused sulphuret. 

 Hence had being as 97'2, the sulpluir is to the chlorine in 

 the respective combinations as 13-09 to 33-8. 



Sulphuret of antimony contains 23*9 percent, of sulphur. 

 Hence antimony being as 42-3, the sulphur in the suljihuret 

 is to the chlorine in tiic butter of antimony, as 14-86 to 

 34-G. 100 



