S34^ StJLPHUKET OF LEAP, AKTIMOXY, AND COPPER. 



but this omission is, it is evident, immaterial, as the quan« 

 tity of this sulphiiret in the ore must be the complement of 

 the sum of the two others. 



But as the iron is a foreign adventitious substance in thi* 

 ore, it follows that the foregoing quantities are <he products 

 of only 96*65 grains of it. 100 parts of the ore are there 

 Component ore composed of 



Mitsoftheore: Sulphuret of lead - 49'7 



Sulphnret of antimony 29-6 



Sulphui'ct of copper - 20'7 



100-0 



-«r probably in It is impossible not to be struck with the trifling alter- 



pro^'oitions^ atiou M hich these quantities require, to reduce them to very 



simple proportions, or to think it a very great violation of 



probability to suppose that experiments, aifected with no 



errours, would have given them thus : 



Sulphuret of lead - 50. 



Sulphuret of antimony - SO. 

 Sulphuret of copper. - 20. 

 Rut pcihaps no However, I doubt the existence of triple, quadruple, &c. 

 thantwoTprox'i- ^^™P°^"*^^ ' I believe, th^i all combinatmi is binary ; that 

 laate elements, no substance whatever has more than two proximate or 

 true elements ; and hence I should be inclined to consider 

 the present compound as a combination of galena and fahl- 

 ertz ; and if so, it will be accurately represented, as far 

 as chemical annalysis has yet been able to go by the follow- 

 ing figure : 

 True nature of y^ (^ sulphur 



the compound. Compound I f galena ~ | 5 lead 

 sulphuret \ ^ 



of lead, zz< 



antimony, 1 rl sulphuret of__ f -^ sulphur. 



and copper f f fahlertzzz ; antimony 1| antimony, 



^ i -I sulphuret of V -sulphur, 



V copper \ |.copper. 



Ultimate ele- Its ultimate elements are therefore, 

 ments. 



and 



Sulphur 



20 . . 



Lead 



Antimony - 

 Copper - 



41|. . 

 25 . . 

 13f . 



