MERCURY. 



169 



For the bromide Hardin's data, are — 



Weight HgBr^. 



.70002 



.56430 



.57142 



.772S5 



.80930 



.85342 

 1.11076 

 I 17270 

 1. 26186 

 1. 40142 



And for the cyanide- 



Weight Hg. 

 .38892 

 •31350 



.31750 

 .42932 



.44955 

 .47416 

 .61708 



•65145 

 .70107 



.77870 



Per cent. Hg. 

 55.558 

 .555 



563 

 550 

 548 

 560 

 555 

 551 

 559 

 565 



Mean, 55.556, ± .0012 



.0004 



In the last series cited no potassium cyanide was used, but the solution 

 of mercuric cyanide, with the addition of one drop of sulphuric acid, 

 was electrolyzed directly. 



The direct ratio between silver and mercury was determined by throw- 

 ing down the two metals, simultaneously, in the same electric current. 

 Both metals were taken in double cyanide solution. With Hardin's 

 equivalent weights I give a third column, showing the quantity of mer- 

 cury corresponding to 100 parts of silver. Many experiments were re- 

 jected, and only the following seven are published b}^ the author: 



.0051 



