ATOMIC WEIGHTS 137 



In a second series, conducted with special precautions to avoid me- 

 chanical loss by spurting, Marignac found : 



24.717 grm. acetate gave 15.983 Ag. 64.665 per cent. 



21.202 " 13.709 " 64.661 



31.734 " 20.521 " 64.666 



Mean, 64.664, ± .0010 



Other experiments, comparable with the preceding series, have more 

 recently been published by. Hardin,' who sought to redetermine the atomic 

 weight of silver. Silver acetate and silver benzoate, carefully purified, 

 were subjected to electrolysis in a platinum dish, and the percentage of 

 silver so determined. For the acetate, using vacuum weights, he gives 

 the following data, the percentage column being added by myself : 



Combining this series with those of the earlier investigators we have : 



Redtenbacher and Liebig 64.6006, ± .0018 



Marignac, 1st series 64.609, ± .0040 



Marig-nac, 2d series 64.664. ± .0010 



Hardin 64.637, ± .0011 



General mean 64.6434, ± .0007 



With silver benzoate, C^HgAgO,, Hardin's results are as follows : 



1 ,Jnurn. Amer. Chem. Soc, IS, 990. 1896. 



