"Why, the other day, I went into town with your father's watch, to get a new crystal put in; and when I was at the watchmaker's, I saw a curious-shaped piece of iron hanging up. I asked the man what it was. He said it was a magnet, that he kept to touch needles. Then he gave me a nail, and let me see how the magnet would attract it. He told me, too, that if I had a knife, and would rub my knife on the magnet, the knife would attract, too; and so I did rub it, and I found that my knife would attract the nail, though not very strong. Then I asked him if any piece of iron would attract, after it was rubbed upon the magnet; and he said that _iron_ would not, but that any piece of _steel_ would. He told me that if I would bring a larger piece of steel, when I came after the watch, he would rub it for me, and then I should have a larger magnet. I told him I had not any steel. But he said any old file would do, and that I might grind the sides and edges a little, and make it smooth. "So, when I came home, I found some old files in the barn. Some were three-cornered, and some were flat. I thought the flat would be the best shape, and I asked your father if he would give me one of them. He said he would; and so I ground the ends square, and the sides smooth, upon the grindstone. Then, when I went after the watch, the man rubbed it for me, and it makes a very good magnet." Then Rollo and Nathan went back, and repeated this story to their father. "Very well," said their father; "that was a very good way to get a magnet. I remember giving Jonas the file; but I did not know what he wanted it for." "I think a magnet is a very curious thing," said Rollo. "See how the nail sticks to it!" "There are a great many other things curious about it," said his father, "besides that." "What?" said Rollo. "I should want some other apparatus to show you," replied his father. "And can't you get the other apparatus?" "I don't know. Perhaps mother might get it. Yes, I'll tell you what we will do. I will name some things which mother may prepare, and you may get them together upon the table in the kitchen, when they have got the kitchen all in order. Then I will come out, and give you all, out there, a lecture upon magnetism." Rollo and Nathan were exceedingly pleased with this plan; and even Rollo's mother looked somewhat gratified. She said she did not know much about magnetism, and she meant to go out into the kitchen herself, and hear the lecture. "And what things shall we get?" said Rollo. "Two or three needles," replied his father, "some fine, and some coarse; some thread, a saucer nearly full of water, a cork, the sand-box off of my table, and a sheet of white paper. Put them all in good order upon the table, and set the chairs around it. Then, when all is ready, come and tell me."