ELECTKO-MAGNETISM. 1 53 



lift up the whole magnet, but I have no power 

 to overcome the magnetic power which is here 



Fig. 54. 



evident. I might give you an infinity of illus- 

 trations of this high magnetic power. There is 

 that long bar of iron held out, and I have no 

 doubt that if I were to examine the other end 

 I should find that it was a magnet. See what 

 power it must have to support not only these 

 nails, but all those lumps of iron hanging on to 

 the end. What then can surpass these evidences 

 of the change of chemical force into electricity, 

 and electricity into magnetism ? I might show 

 you many other experiments whereby I could 

 obtain electricity and chemical action, heat and 



