ATOMIC WEIGHTS 107 



The mean of both series, taken as one, is 51.989; which, corrected to a 

 vacuum standard, becomes 52.011, ±.0018. 



In three determinations Maumene ' obtained the following figures : 



ECl. AgCl. Ratio. 



10.700 20.627 51.874 



10.5195 20.273 51.892 



8.587 16.556 51.868 



Mean, 51.878, ± .0049 



These figures seem to represent weights in air, but they are hardly 

 worth correcting. 



Two other analyses, with vacuum reductions, were made by Thiel ' 

 incidentally to his research upon indium : 



KCl. AgCl. Ratio. 



7.4314 14.2903 52.003 



7.4321 14.2939 51.995 



Mean, 51.999, ± .0027 



Assembling the data for both ratios, we now have the following com- 

 binations : 



Ratio Ag: KCl:: 100: x. 



Marignac 69.098, ± .0017 



Stas, first 69.1036, ± .0003 



Stas, second 69.1033, ± .0003 



Stas, third 69.1190, ±: .0003 



Stas, fourth 69.1230, ± .0002 



Richards and Archibald 69.1145, ± .0003 



Archibald 69.114, ± .0007 



Richards and Staehler 69.1073, ± .00032 



General mean 69.1138, ±: .00011 



Ratio AgCl : KCl :: 100 : x. 



Berzelius 51.997, ± .0049 



Marignac 52.011, ± .0018 



Maumene 51.878, ± .0049 



Richards and Archibald 52.0215, ± .0003 



Thiel 51.999, =t .0027 



Archibald 52.024, ± .00055 



Richards and Staehler 52.0118, ± .00025 



General mean 52.0163, ± .00018 



■Ann. Chim. Phys. (3), 18, 41. 1846. 

 'Zeitsch. anorg. Chem., 40, 313. 1904. 



