"I will show you how to do it," he said. "Then I will help you just a little."

He showed them how to strike out, first

with one foot and then with the other. His tracks looked like this:

Then Polly tried, but her tracks looked like this:

"That is not the way, Polly," said her father. "You are skating with your right foot. But you are only pushing with your left. You must skate with both. Watch me again."

Then Peter tried. His tracks looked like this: