"I tried lots of pieces."
"Any thing else?"
"Stones," said Charlie, eagerly.
"What are these?" I asked, holding up a couple of heavy stones he had
put among the things the magnet pulled.
"I guess I put those there by mistake," said Charlie, testing with, the
magnet a number of stones in the other pile.
"Try them," I said.
"O!" he said, as the magnet lifted them; "I forgot. It does lift some
stones."
"Well, what else have you in that pile of things the magnet did not
pull?"
"Glass, leather, lead, bone, cloth, tin, zinc, corn, and a lot of
things."
"Very well. Now let us see what the magnet does pull."
"Iron keys," said Charlie, "and nails."
"Here's a nail in this other pile."
"That's a brass nail. The magnet pulls only iron nails."
"What else have we in this pile?"
"Needles, hair-pins, screws, wire--iron wire," he added quickly. "Brass
wire doesn't stick, you know."
"How about this?" I asked, taking a small coil of copper wire from my
desk.
"I guess that won't stick," said Charlie. "Because that's copper wire,
and the magnet doesn't seem to pull any thing that isn't iron.
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