56 THE ROYAL SOCIETY OF CANADA 



(11) Quantitative Study of the Electrolysis of Sodium Sulphide and 

 Sodium Hydrogen Sulphide solutions 



By W. R. Fetzer, M.A. 



An analtyical method was devised for determining the various 

 sulphur salts that may occur in solution together with sodium sulphide. 

 When the current density is not too high, considering the concentration 

 of the solution and the amount of stirring, polysulphide alone is 

 formed at the anode in sodium sulphide solutions, 16.0 g of sulphur 

 being liberated per faraday; at higher current densities sulphates are 

 formed and the amount of polysulphide falls off. When the acid 

 sulphide is electrolysed hydrogen sulphide and polysulphide are 

 formed : their amounts under various conditions were determined. 



(Under direction of Professor W. Lash Miller) 



(12) Study of Automatic Current Regulation in Electric Furnaces 



By J. Kelleher and E. R. Westman 



Continuation of the work published by J. K. in Trans. Am. Electrochem. 



Soc. 



(13) Recovery of Precious Metals from the Anode Slimes in Nickel 



Refining 



By H. W. Powell 



Anode slimes, from which most of the nickel and copper had been 

 removed by treatment with sulphuric acid, were roasted in oxygen 

 at 650°C and then in hydrogen at the same temperature in a small 

 rotary electric tube furnace with continuous feed (about 4 oz. per 

 hour). All copper, nickel, silver, and palladium could be dissolved 

 from the roast by leaching at 70°C with a solution containing one 

 vol. nitric acid, one vol. sulphuric acid, and 12 vols, water. 



(Under direction of Professor J. T. Burt-Gerrans) 



