LEAD. 73 



were intended rather to fix the atomic weight of sulphur, 

 dissolved in each estimation ten grammes of pure lead in 

 nitric acid, then treated the resulting nitrate with sulphuric 

 acid, brought the sulphate thus formed to dryness, and 

 weighed. One hundred parts of metal yield of PbS04 • 



146. 3S0 

 146.400 

 146.440 

 146.458 



Mean, 146.419, =fc .012 



Turner/'' in three similar experiments, found as follows : 



146.430 

 146.398 

 146.375 



Mean, 146.401, ± .Oil 



In these results of Turner's absolute weights are implied. 



The results of Stas' syntheses,! effected after the same 

 general method, but with variations in details, are as follows. 

 Corrections for weighing in air were applied : 



146.443 

 146.427 

 146.419 

 146.432 

 146.421 

 146.423 



Mean, 146.4275, rh .0024 



Combining, we get the subjoined result : 



Berzelius 146.419, ±.012 



Turner 146.401, ±.011 



Stas 146.4275, ± .0024 



General mean 146.4262, 4z .0023 



Turner, in the same paper, also gives a series of syntheses 

 of lead sulphate, in which he starts from the oxide instead 



*Phil. Trans., 1833, 527-538. 

 f Aronstein's Translation, ^iH- 



