[Illustration: Seaweed]
A big green wave came rolling in, and the children quickly took hold of hands. They jumped up as the wave broke over them. It knocked some of them down and stood Clam on his head. Somebody caught his feet, and the others all laughed. He came up angry and choking, when another wave caught him and rolled him over again. After that the boys came crowding around Thorn, waving their arms.
"You must learn to swim," they cried. "It is easy. Make your arms go this way and your feet this way"; and they showed him how.
Thorn tried it and went straight to the bottom. The boys shouted.
"Here is a log," they said. "Put your arms over that. It will keep you up till you learn."
