88 MOLECULAR WEIGHT OF ARGENTIC SULPHATE, ETC. 



The lowest value in this case, as well as in the case of nitrogen, is the 

 one supported by the recent work on the densities of gases. 



In conclusion, it is a pleasure to acknowledge the generous assistance 

 cf the Carnegie Institution of Washington, without which the present 

 work could not have been performed. 



SUMMARY. 



The most important results of the research may be briefly summed up as 

 follows : 



(1) A method for the preparation of pure argentic sulphate was devised. 



(2) The specific gravity of argentic sulphate (previously fused) was 

 found to be 5.45. 



(3) Indication was obtained that Stas was unable wholly to reduce sil- 

 ver sulphate in hydrogen. 



(4) Argentic sulphate was found to be occluded by silver chloride from 

 solutions containing an excess of sulphuric acid. 



(5) It was proved that argentic sulphate can be completely converted 

 into silver chloride by heating in a current of hydrochloric acid gas. 



(6) 100.000 parts of argentic sulphate were thus found to yield 91.933 

 parts of argentic chloride. 



(7) The atomic weight of sulphur as calculated from this ratio, if 

 oxygen is taken as 16.000, with several assumed values for silver is : 



Ag = 107.93 5 = 32.113 



Ag = 107.89 5 = 32.078 



Ag = 107.88 5 = 32.069 



Attention is called also to the summaries of the three previous papers 

 on pages 24, 44, and 65. 



