“Dick, ahoy!”

There was a pause and he shouted again:

“Dick, ahoy!”

“Ahoy!” came back faintly from somewhere a long way off.

“There he is!” I cried.

“No—an echo,” said Uncle Jack. “Ahoy!”

“Ahoy!” came back.

“There, you see—an echo.”

“Ahoy!” came again.

“That’s no echo,” cried Uncle Bob joyfully. “Dick!”