252 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



Hence Hg= 200.058. 



For the bromide Hardin's data are- 



Mean, 73.829, ± .0012 



Mean, 55.556. ± .0012 



Hence Hg = 199.803. 



And for the cyanide- — 



Mean, 79.339, ±: .0004 



Hence Hg= 199.835. 



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

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

 was electrolyzed directly. 



