of the latter as at the first place they stopped, but the caverns were larger.
"Gold—I don't see any gold," remarked Ned Newton, with a disappointed air. "Where it?"
"Bless my pocketbook, yes! Where is it?" demanded Mr. Damon.
"Oh, we've got to dig for it," explained Abe. "It's only when there's been a slight thaw that some of th' pebble nuggets kin be seen. They're under th' ice, an' we've got t' dig for 'em."
"Does it ever thaw up here?" asked Mr. Parker. "The ice of the caves seems thick enough to last forever."
"It does thaw an' melt some," went on the miner. "But some of th' caves last all through what they call 'summer' up here, though it's more like winter. We're above th' Arctic circle now, friends."
"Maybe we can keep on to the Pole," suggested Ned.
"Not this trip," spoke Tom, grimly. "We'll try for the gold, first."
"Yes an' I'm goin' t' begin diggin' right away!" exclaimed Abe, as he turned back into the airship, and came out again with a pick and shovel, a supply of which implements had been brought along. The others followed his example,
