[ 81 1 



XIII. An Attempt to determine the definite and simple PrO' 

 portions, in which the arnstiluent Parts ofunorganic Sub- 

 stances are united with each other. By Jacob Berze-* 

 X.IUS, Professor of Medicine and Pharmacy, and M.R.A, 

 Stockholm. 



[Continued from page S ] 



II. Lead and Sulphur. 



J.) J. EN grammes of very pure lead were melted, in a 

 small glass retort, with ten siramnies ot pure lemon-coloured 

 sulphur, which had been carefully sublimed and melted in 

 a strong heat, in order to expel the moisture. The opening 

 of the retort was connected with a small pneumatic appa- 

 ratus, but no perceptible quantity of gas was emitted, ex- 

 cept a little sulphurous acid gas, which had occupied the 

 place of the oxvcen that had disappeared. The mass was 

 ignited until the yellow colour, produced in the retort by 

 the sulphurous acid fumes, was no longer visible: and 

 while the apparatus cooled, some water was absorbed in 

 the place of the air that had been forced out, I cut off the 

 body of the retort, and found the w eight of the sulphuret 

 11-55 gr. 



2.) A repetition of the experiment gave 11-555 grammes 

 of the sulphuret. 



3.) The experiment was repeated with the additional pre- 

 eaution of burning a little sulphur in the receiver cemented 

 to the retort, and strongly healing it, before the retort it- 

 self was warmed, so as to deprive the air in the receiver of 

 its oxygen. The retort was heated till it began to bend. 

 The sulphuret weighed 11-56 grammes. Consequently 

 100 parts of pure lead take up 15-d of sulphur, or exactly 

 twice as much as of oxygen. I have not been able to dis- 

 cover any other sulphuret of lead than this. We have 

 therefore for the sulphuret of lead. 



Lead 86-51 lOO'O 



13-49 15-6 



Wenzel, on Affinities, gives 86-8 and 13*2 for the pro- 

 portion of the lead to the sulphur. 



III. Sulphur and Oxygen. 



Klaprolh, Bucholz, and Richter have very accurately ex- 

 amined the proportion of oxvgen in the sulphuric acid, and 

 their experimtrnts agree extremely well with each other. 

 But it became so much the more necessary to repeat these 



Vol.41. No. 178. Feb. 1813. F expert- 



