He struck it first upon one side, and then upon the other, and thus gradually worked it out. The walnut was crushed all to pieces. The boy then drove in the wedge again, so as to open the log as it was before. He then went to the place where he had got the beetle and wedge at first, and brought a large wooden wedge which he had made before, and began to put that into the crack, not very far from the iron wedge. "This will keep it open," said he. "Yes, I think it will," said Rollo. "But put it up close to the iron wedge." "No," said the boy; "for then I can't knock the iron wedge out." So the boy put the large wooden wedge in, at a little distance from the iron one, and drove it in rather gently with the beetle. This opened the cleft a little more, so that the iron wedge came out pretty easily. "I don't see what makes the sides of the logs draw together so hard," said Rollo. "O, they can't help it," said the boy. "That is no reason," rejoined Rollo. "I should think that, after the log is once split open, it would stay so. If I split a piece of wood in two with my knife, the pieces don't try to come together again." So Rollo began to examine the log, and to look into the cracks, to see if he could find out what it was that made the parts draw together so hard as to crush the walnut. Presently, he observed that the log was not split open from end to end. The crack commenced at one end, and extended nearly towards the other, but not quite; so that at this other end the log was solid and whole, just as it always had been. So Rollo perceived that the two halves being joined and held together firmly here, they could only be separated at the other end by the wedge springing them open, and, of course, by their elasticity they tended to spring together again. Then besides, he saw, by looking into the crack, a great number of splinters, large and small, which extended obliquely from one side to the other, and bound the two sides strongly towards each other. By this time the boy had got the wedge knocked out. "It is strange," said Rollo, "that such a small wedge will split such a tough and solid log." "O, not very strange," said the boy. "You see," he continued, taking up the wedge, and pointing to the several parts as he explained them, "you see here at this part, where it enters the wood it is sharp, and the sides spread out each way, so that, when I drive it in, they force the wood apart." "Why don't they have the back of the wedge wider still? and then it would force the wood open farther; and then you would not have to put in a wooden wedge afterwards,--so," he added, making a sign with his fingers. He put the tips of his fingers together, and then separated his hands, so as to represent a very blunt-shaped wedge. "Then it would not drive in so easily," answered the boy. "Perhaps I could not drive it in at all, if it was so blunt."