"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."
[Illustration: Thorn learns to swim]
Thorn kept on trying, and in a few days he could swim a little.
"You do very well," said Foam.
The next day, when the tide was out, the boys waded in and picked up periwinkles and oysters and clams, and threw them up on the beach.
When Periwinkle began to open his oysters, he took a brown bowl to put them in. Once, in breaking a shell, his stone knife struck the bowl and broke it.