ATOMIC WEIGHTS 



75 



Series II. Baxter. 



Mean, 64.6230, ± .0001 



Combining both series, the mean value for the ratio is 



IA:2Ag:: 100: 64.2229, 



.0001 



THE SILVER-CHLORINE RATIO. 



For the ratio between silver and chlorine there are many series of de- 

 terminations, some direct and some indirect. As with numerous other 

 ratios, the first work entitled to any consideration was done by Berzelius.^ 



He made three estimations, using each time twenty grammes of pure 

 silver. This was dissolved in nitric acid. In the first experiment the 

 silver chloride was precipitated and collected on a filter. In the second 

 and third experiments the solution was mixed with hydrochloric acid 

 in a flask, evaporated to dryness, and the residue then fused and weighed 

 without transfer. One hundred parts of silver formed of chloride : 



132.700 

 132.780 

 132.790 



Mean, 132.757, ± .019 



Turner's work^ closely resembles that of Berzelius. Silver was dis- 

 solved in nitric acid and precipitated as chloride. In experiments one, 

 two and three the mixture was evaporated and the residue fused. In 

 experiment four the chloride was collected on a filter. A fifth experi- 

 ment was made, but has been rejected as worthless. 



The results were as follows : In a third column I put the quantity of 

 AgCl proportional to 100 parts of Ag. 



1 Thomson's Annals of Philosophy, 15, S9. 1820. 



2 Phil. Trans., 1829, 291. 



