ANALYSIS Ot JAMEs's POWDER. g]jr 



15xp# 2. As I perceifcd, before I decomposed the salt by and .»mcfree 

 means of barytes, that the solution contained an excess of P°f** h holding 



A 1 X • 1 1 1 , • 1.1 0XUie ° f aUtl " 



free potash, 1 wished to ascertain, whether this potash oid inonyataiui- 

 not hold iu suspension a little oxide of antimony. In fact minum * 

 having decanted the fluid, to separate it from the sulphate 

 of barytes, I poured into it some sulphuretted hidrogen, 

 which immediately formed golden sulphur of antimony. 

 The free potash, therefore, was combined with a portion of 

 antimony at a minimum of oxidation. Dr. Pearson does 

 not speak of this combination, «r of the sulphate of potash. 



Exp. 3. I took the James's powder, which had been Nitric acid <fi*. 

 washed with warm distilled water, and heated it with ptate«fliai!e 

 nitric acid of the strength of 20°. This acid dissolved the 

 phosphate of lime, without attacking the oxide of anti- 

 mony at a maximum. I separated this oxide from the so- 

 lution, and poured into the liquor some ammonia, which 

 precipitated the phosphate of lime. 



Exp. 4. I decomposed the phosphate of lime with Itsquamit? 

 diluted sulphuric acid, and afterward recomposed it by dScai ,ne 

 means of lime water, in order to ascertain the proportions. 



Exp. 5. 1 took the oxide of antimony at a maximum Oxide of anti- 

 of oxidation, and dissolved it in muriatic acid. This so- m . on V treated 

 lution, treated with sulphuretted hidrogen, produced a a^ 

 hidrosulphuret of antimony, containing more sulphur than 

 Icermes mineral, and less than the golden sulphur. 



From these* experiments, all the products of which I Component 



weighed, the 19 deci^r. of James's powder, which I ana* ] ^ ns °, f 



iysed, are composed of dcr. 



Parts. 

 Oxide of antimony at a maximum of oxidation • • 7 



Phosphate of lime - 4 



Sulphate of potash 4'5 



Free potash, holding oxide of antimony at a mi- 

 nimum ♦•* 3*5r 



ID 

 To xecompose this powder we must take Method of 



Parts., composing it. 



Sulphuret of antimony 4 



Calcined phosphate of lime- .* . 3 



Nitiate of potash g* 



These 



