They had great thick chisels and heavy wooden mallets in their hands, and there was a big bit, or "borer," as the little boy called it, lying on the ground between them. And I don't know why "borer" isn't a better name for it. There were some round holes in the beams which had been made by the borer, and the men were making those round holes square with the chisels. One of the men had just finished a hole when the little boy came, and he went ahead to the next round hole, and he put the edge of the chisel carefully against the wood, and he struck it with the mallet. _Plack!_ _Plack!_ _Plack!_ shrieked the mallet on the chisel. _Ugh!_ _Ugh!_ _Ugh!_ the wood grunted, and it seemed to shiver when the mallet struck. [Illustration: CUTTING A HOLE] Then there was a splintering noise and a part of the wood broke away. _Plack!_ _Plack!_ _Plack!_ screamed the mallet again. The wood grunted again, but it was of no use, and another piece broke away. And then the man hit the chisel again and another piece broke off, and the chisel came through on the other side of the beam. And the carpenter drove the chisel through at the other side of the hole, in the same way; and what had been a round hole was a square one. Then he laid the mallet down and took the chisel in both hands, and he leaned over the square hole and made the sides all smooth with the chisel. Then he made a sort of sloping hole, a kind of a little square trench, and it went from the side of the beam into the square hole. Then he put his tools down and looked at the little boy again and smiled. "There!" he said. "That's done." The little boy smiled back at him. "Is it?" he said. "What goes in that hole? I could put my hand in it." "It's not for little boys' hands," answered the carpenter. "The end of a short beam goes in there. I'll show you. We have to make places for the chimneys to come through and so people can go upstairs without knocking their heads. Did you ever think of that?" The little boy shook his head, and he came nearer. "Show me." So the carpenter went to a little pile of short beams; and he took one and brought it back. And he turned the big beam on edge, and fitted the end of the little beam into the hole. The end of the little beam had already been made small, so that it would go in. "There," he said. "Now here, where I stand, will be the stairs for people to go up, and there will be that other big beam on the other side. We have to leave this big hole in the floor so that a man can go on the stairs without hitting his head, you know. Everywhere else will be a floor, except where the chimneys come through. Do you understand?" The little boy nodded. He thought that he understood, although it was not very easy to understand. And while he was trying to understand better, there came a voice behind him. "Hello! I wondered where you were."