Poor Nathan could not understand this grave, philosophical disquisition very well, and he began to get pretty sleepy. He had, however, been somewhat amused, during the greater part of the time, in seeing the corks float about upon the water, with the needles upon them. So his father took the needles off, and let him have the two floats in one of the saucers to play with, a few minutes, while Dorothy put the other things away. He asked her to put all the things away together, so that they could get them ready the next evening, and then he said that perhaps he would give them another lecture. INTELLECTUAL PHILOSOPHY Rollo's father gave one or two other lectures upon magnetism, in the course of which Rollo found out a good deal about the subject; and, having learned from his father's explanations that any magnet, when balanced freely, would point to the north and south, that is, one end to the north and the other to the south, he determined to try the experiment. He accordingly poised a needle carefully upon a cork, as his father had done in his lecture, and put it in a basin of water upon the platform. But he did not succeed very well. The needle would always swing round, and turn its point towards the garden gate; but Rollo knew very well that the garden gate was not north from the platform. He remembered that the North Star was over the barn, for he and Jonas had noticed it particularly when they had made the dial. The needle, therefore, ought to have pointed towards the barn, according to his father's lecture; but it would not. Rollo took up a straw, and pushed the point of the needle round, and said, "Point there! point there, I tell you!" But all in vain. The needle would not heed either his pushing or his commands; but, as soon as he let it go, it would immediately swing back into its old position, where it pointed towards the garden gate. Rollo was just about giving up in despair, when he saw his sister Mary coming in from the garden gate, with a book under her arm. "O Mary," said he, "what shall I do? My needle won't point right." "Why, what is the matter with it?" said Mary. "It will point over towards the garden," said Rollo; "look." So Mary came up, and looked at his needle. She saw that it was pointing towards the garden gate. "Now I'll push it away," said Rollo, "and you will see that it comes directly back again." So he took up his straw, and pushed the point of the needle away. The cork moved, turning round rapidly, until at length it swung away towards one side of the basin, and then suddenly drifted up against the side, and stuck there. "That's another plague," said Rollo. "It will run up to the side of the basin, and stick there." "What makes it?" said Mary. "I don't know," said Rollo. Mary sat down upon the platform, and examined the needle and the surface of the water very carefully. She observed that the water was heaped up a little against the side of the basin, all around. She asked Rollo to observe it.