Mark shook his head. "You won't make it there and back before the weather changes," he said. "You and your brothers don't know anything about the forests. You'll have the same trouble the early expeditions had in coming to Washington. And the boys can't do anything without someone to tell them what to do. What if all the stuff in Philadelphia is radioactive? If you bring it back, you'll kill everyone with it. I'm going back to the valley."

"You're going to take orders just like everyone else!" Gary shouted. "Keep him here!" He motioned to two of his brothers, and they hurried from the room. The other three remained with Mark, who was still sitting cross-legged on the floor where he had been from the beginning of the meeting.

In a few minutes Gary returned; he carried several long strips of birch bark. Now Mark stood up and reached for the bark. It was from his canoe.

Gary thrust the scraps at him. "Now you understand, I hope. We leave in the morning. You'd better get some rest."

Wordlessly Mark left them. He went to the river and examined the ruined boat. Afterward he built a small fire, and when it was burning brightly he put one end of the boat in the flames, and as it burned he pushed it forward until it was totally consumed.

The next morning when the boys assembled to start the trek to Philadelphia, Mark was not among them. His pack was gone, he could not be found. Gary and his brothers consulted angrily and decided to start without him. They had good maps that Mark himself had corrected. The boys were all well trained. There was no reason to feel dependent on a fourteen-year-old. They started off, but there was a pall over them now.

Mark watched from a distance, and throughout the day he kept them in sight. When they camped that night, their first night in the open forest, he was in a tree nearby.

The boys were all right, he thought with satisfaction. As long as their groups were not separated, they would be all right. But the Gary brothers were clearly nervous. They started at noises.

He waited until the camp was still, and then, high in a tree where he could look down on them without being seen, he began to moan. At first no one paid any attention to the noises he made, but presently Gary and his brothers began to peer anxiously at the woods, at one another. Mark moaned louder. The boys were stirring now. Most of them had been asleep when he started. Now there was a restless movement among them.