74 THE ATOMIC WEIGHTS. 



of course would change somewhat upon adoption of the modern ratio 

 between and H. 



Observations upon silver acetate, like those of Liebig and Redtenbacher, 

 were also made by Marignac.* The salt was prepared by dissolving 

 silver carbonate in acetic acid, and repeatedly recrystallizing. Two ex- 

 periments gave as follows : 



3-3359 g rm acetate gave 2.1561 Ag. 64.633 per cent. 



3.0527 " J -97 2 7 " 64.621 " 



Mean, 64.627, .0040 



Reduced to a vacuum, this becomes 64.609. 



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 

 Or, reduced to a vacuum, 64.646 



Other experiments, comparable with the preceding series, have recently 

 been published by Hardin, f 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: 



.32470 grm. acetate gave .20987 Ag. 64.635 per cent. 



.40566 " .26223 " 64.643 " 



.52736 " .34086 " 64.635 



.60300 "' .38976 " 64.637 " 



.67235 .43455 64.631 " 



.72452 " .46830 "' 64.636 " 



.78232 " .50563 " 64.632 " 



.79804 " .51590 " 64.646 



.92101 " .59532 " 64.638 ". 



1.02495 " .66250 " 64.637 " 



Mean, 64.637, .0011 

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



Liebig and Redtenbacher 64.6065, .0018 



Marignac, 1st series 64.609, .0040 



Marignac, 2d " 64.646, .0010 



Hardin 64.637, .001 1 



General mean 64.636, .0007 



*Ann. Chem. Pharm., 59, 287. 1846. 



t Journ. Amer. Chem. Soc., 18, 990. 1896. 



