i9o6. SULPHURIC ACID ON DEPOSITION OF METALS. 267 



When three cubic centimeters of acid were present in a solution 

 of iron sulphate, containing o.i gram of iron and it was electrolyzed 

 with a current of two amperes and four volts, 0.069 gram of iron 

 went into the mercury. The experiment was repeated after the 

 addition of four cubic centimeters of acid. Even this quantity failed 

 to hold up all the iron. The separation, therefore, of iron from cop- 

 per and of iron from zinc was unsuccessful. 



University of Pennsylvania. 



