the ice, firming it down with his mitten. It was almost as delicately adjusted as a compass-needle, and now instead of listening they watched. The thin rod quivered a little — the least little jar in the world; then it vibrated steadily for a few seconds, came to rest, and vibrated again, this time nodding to another point of the compass.

“Too soon!” said Kotuko. “Some big floe has broken far away outside.”

The girl pointed at the rod, and shook her head. “It is the big breaking,” she said. “Listen to the ground-ice. It knocks.”

When they kneeled this time they heard the most curious muffled grunts and knockings, apparently under their feet. Sometimes it sounded as though a blind puppy were squeaking