He waved his hand as a sign of encouragement, and his voice came faintly to the girls, but they could not make out what he said. The man ran back up the shore a little way.
"Where's he going?" asked Amy. "Oh, he's going to leave us!"
"No, he's probably gone for help!" said Betty. "Oh, there goes another piece of our floe!"
"Help! Help! Hurry!" shouted Mollie, the others joining their voices to hers.
Presently the man was seen to be pushing something down to the river.
"It's a boat!" cried Betty. "Now we're all right!" And it did seem to be some sort of boat in which the man was coming to the rescue.
CHAPTER XXI
A HELPING HAND
"What is he doing?"