46 URANIUM, ANTIMONY, CHROMIUM, &c. 



formerly called butter of antimony, and usually 

 obtained by distilling a mixture of two parts 

 corrosive sublimate and one part antimony. Its 

 cof\stituents are 



1 atom chlorine 4-5 

 1 atom antimony 5-5 



10 



as was shown long ago by Dr. John Davy. 



5. The dark red substance long celebrated 

 mineral. , ~ , . , . 



under the name of kermes mineral, and constitu- 

 ting an excellent medicinal preparation, though 

 but little used in this country, was suspected by 

 Proust to be a compound of sulphuretted hydro- 

 gen gas and protoxide of antimony. Dr. John 

 Davy demonstrated the truth of this opinion by 

 showing that, when heated, it is converted into 

 ccftnmon sulphuret of antimony and water. 

 When I published a similar set of experiments, 

 about four years ago, I did not recollect at the 

 time that I had been anticipated by Dr. Davy. 

 It is obvious from the experiment just stated, 

 that kermes mineral is a compound of 1 atom 

 sulphuretted hydrogen and 1 atom protoxide of 

 antimony. For sulphuretted hydrogen is a com- 

 pound of 



ATOM. ATOM. 



1 sulphur + 1 hydrogen 

 Protoxide of antimony of 1 antimony _{_ 1 oxygen 



The atom of sulphur combining with the atom 



16 



