410 ZINC, CADMIUM, LEAD, c. 



1 atom bismuth 9 



1 atom sulphur 2 



11 



The previous analyses of sulphuret of bismuth 

 by Dr. John Davy and Mr. Lagerhjelm almost 

 coincide with this experiment of mine. Dr. 

 John Davy * found it a compound of 



Bismuth 9 



Sulphur 2-007 



M. Lagerhjelm obtained t 



Bismuth 9 



Sulphur 2-0268 



Dr. John Davy's experiment was conducted 

 nearly in the same way as my own : he em- 

 ployed 100 grains of bismuth I presume the 

 bismuth of commerce. Now, the presence of 

 a very small portion of iron in this bismuth, 

 would account for the slight excess of sulphur, 

 which scarcely exceeds one third per cent. La- 

 gerhjelm's analysis is not quite so near the truth 

 as Dr. Davy's. 



4f. Vauquelin, in a set of experiments, pub- 

 lished a number of years ago, upon the quantity 

 of sulphur with which the metals combine when 

 heated or fused with that substance, states that 

 he found sulphuret of bismuth composed oft 



* Phil. Trans. 1812. p. 200. f Annals of Philosophy, IV. 357. 

 Ann. de Mus. d'Hist. Nat. XV. 9. 



