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ELECTRO-MAGNETISM.
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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 illustrations 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
