55 



in iron than in copper ; or else that it is more increased in copper 

 than in iron, or increased in copper while diminished in iron, if it is 

 not in each metal diminished, as the author is led by a partial in- 

 vestigation of the absolute effect in each metal to believe. 



5. The result previously arrived at regarding the effect of longi- 

 tudinal magnetization on the conductivity of iron is confirmed ; and 

 an experiment that would have been found impracticable by the 

 less satisfactory method, proves the same conclusion for magnetized 

 steel wire, with the magnetizing influence away. Two very different 

 experiments show further, that the electric conductivity of magnetized 

 iron is greater across than along the lines of magnetization. A last 

 experiment, showing that iron gains in conducting power by mag- 

 netization across the lines of the electric current, leads to the con- 

 clusion that there is a direction inclined obliquely to the lines of 

 magnetization, along which the conductivity of magnetized iron 

 would remain unchanged on a cessation of the magnetizing force. 



