ATOMIC WEIGHTS 



115 



Ag. 



9.G4484 

 11.12810 



NH.Cl. 



4.78257 

 .5.51744 



Ratio. 



49.587 

 49.581 



Mean, 49.584, ± .0020 



Scott also made one determination of the ratio AgCl rlSTH^Cl. 4.7850 

 grammes NH4CI balance 12.82048 of Ag. The ratio, therefore, is 

 100:37.3234. 



The several values for the ratios Ag : NH^Cl : : 100 : x now combine as 

 follows : 



Pelcuze 49.5365, ± .0130 



Marignac 49.556, ± .0055 



Stas, nrst series 49.589, ± .0018 



Stas, second series 49.597, ± .0006 



Stas, third series 49.594, ± .0005 



Scott 49.584, ± .0020 



General mean 49.5965, ± .00038 



For the ratio between ammonium chloride and silver chloride there is 

 a series of nine determinations by Eichards, Koethner and Tiede.' The 

 values found are as follows : 



NH.Cl. 



2.02087 

 2.23894 

 1.55284 

 1.36.579 

 1.63939 

 1.93795 

 2.89057 

 1.31405 

 1.82091 



AgCl. 



Ratio. 



^ Journ. Amer. C'hem. Soc, 31, 6. 1909. The actual analyses were made by Tiede. Professor 



Richards has kindly furnished me with the three following determination?: of this ratio, which 



were made by Ticde, but not used in the published memoir: 



NHiCl. AgCl. Ratio. 



1.10489 2.9607 37.3185 



.95997 2.5723 37.3195 



.75331 2.0186 37.3184 



Mean, 37.3188, ±.00025 

 These figures were received too late for use in the systematic discussion. If included in the main 

 series they would tend to lower the atomic weight of nitrogen by 0.001. 



