106 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



Ratio. 

 69.109 

 69.107 

 69.106 

 69.107 

 69.109 

 69.106 

 69.107 



Mean, 69.1073, ± .00032 



For the silver chloride ratio Eichards and Staehler give the subjoined 

 figures : 



ECl. AgCl. Ratio. 



4.36825 8.3986 52.012 



5.56737 10.7038 b2.013 



6.41424 12.3323 52.012 



3.27215 6.2913 52.011 



4.83028 9.2870 52.011 



Mean, 52.0118, ± .00025 



Several earlier measurements of the silver chloride ratio remain to 

 be mentioned. First, Berzelius ' found that 100 parts of KCl were equiva- 

 lent to 192.4 of AgCl, a value which, corrected for weighing in air, be- 

 comes 193.32. Hence AgCl : KCl : : 100 : 51.997. 



In 1842 Marignac " published two determinations, as follows : 



KCl. 

 17.034 



14.427 



AgCl. 

 32.761 



27.749 



Ratio. 

 51.995 

 51.991 



Mean, 51.993, 



Four years later, Marignac ' published a second series of determinations. 

 The new figures are: 



^ Poggend. Annal., S, 1. 1826. 

 * Oeuvres Completes, 1, 60. 



3 Oeuvres Completes, 1, 78. The figures of the first set are republished in this series, but not 

 repeated here. Marignac treats the five experiments as one series. 



