It sticks fast."
"Pull harder."
Charlie braced himself for a strong pull. Suddenly the bar came off, and
he went tumbling backward.
"What did you say makes it hold so hard?" said he, getting up.
"Magnetism," said I again.
"But what is magnetism?"
"I couldn't tell you if I tried; but I think you could learn a great
deal about it with that magnet. You will find a lot of things in that
box that may help you."
Saying this, I left him to pursue his studies as best he could. When I
came back, I found him more puzzled than when I left him.
"That's the queerest thing I ever saw," he said. "Some things just jump
at it as though they were alive; some things it pulls; and some things
it doesn't pull a bit."
"That's a very long lesson you have learned," I said. "What does it
pull?"
"These," he said, pointing to a pile of things on one side of the box.
"And these things it doesn't pull."
"Let us see what you have in this pile," I said, looking at the first
little heap; "keys?"
"Trunk keys," said Charlie. "It doesn't pull door keys. I tried ever so
many."
"Try this key," said I, taking one from my pocket.
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