336 



SULPHURET OF LEAD, ANTIMONY, AND COPPER/ 



Instances, 



muldtude of instances nhich I could adduce, in support of 

 Such being the fact, I will for the sake of brevity confine 

 myself to a few, in the substances which have come under 

 consideration above, as they will likewise give the grounds, 

 on which some of the proportions in the table have been 

 assignedj and every chemist, by a careful repetition of the 

 experiments, may easily determine for himself to what at- 

 tention the present theory is entitled. 



Lead 



Sulphuret of lead 



Sulphate of- lead 



Antimony ' *^ , 



Sulphuret of anti- 

 mony 



Z~-| of sulphate of lead 

 iz f of sulphuret of lead 

 zz-| of lead 

 zz-| of sulphate of lead 

 zz I" of lead 



zz -f of sulphuret of lead 

 : — |- of powder of algaroth 

 ^~Z J of sulphuret of antimony 



Perhaps the 



n --^ of powder of algaroth. 



In the experiments by which these relations wore ascer.^ 

 tained, the portion of powder. of algaroth and sulphate of 

 lead dissolved in the precipitating and washing waters 

 was scrupulously collected. 



The importance of a knowledge of the true quantity in 



quantity of an -which matters combine is too evident, to requii'e to be 

 presses its force dwelt upon ; but this importance will be greatly augmented, 

 of attraction, ff jt should prove, that this quantity is, as has been sug- 

 gested, expressive of the forces with which they attract 

 each other. It is perhaps in the form of matters, that we 

 shall find the cause of the proportions in which they unite, 

 and a proof, a priori, of the system here maintained. 



Gray copper 

 ore. 



I have examined some of the gray ores of copper in te- 

 traedral crystals; but the notes of my experiments are in 

 England. I can however, say, that they do contain anti- 

 mony, and that they do not contain iron in any material 

 quantity. With respect to the proportions of the consti- 

 tuent parts, I cannot now speak with any certainty; but, 

 I think, that at least some species of fahlertz contain a 

 smaller portion of sulphuret of antimony, than the fahlertz 

 does Avhich exists as an element in the foregoing compound- 

 one. 



OJ 



