ared again with
the summons. Silence, formidable and unbroken, succeeded.

"House to house search is now in order," he said. "Must be in here
somewhere--unless the seals got him."

Cautiously the boat moved forward. Once she grazed on a half submerged
rock. Again a tiny islet loomed before her. Scattered bones glistened on
the rocky shore, but they were not human relics. Occasional beaches
tempted a landing, but all of these led back to precipitous cliffs except
one, from the side of which opened two small caves. Into the first the
lantern cast its glare, revealing emptiness, for the arch was wide and the
cave shallow. The entrance to the other was so narrow as to send a visitor
to his knees. But inside it seemed to open out. Moreover, there were fish
bones at the entrance. The captain, the surgeon, and Congdon, the
coxswain, landed. Captain Parkinson reached the spot first. Stooping, he
thrust his head in at the orifice. A sharp exclamation broke from him. He
rose to his feet, turning a contorted face to the others.

"Poisonous," he cried.

"More volcano," said Trendon. He bent to the black hole and sniffed
cautiously.

"I'll go in, sir," volunteered Congdon. "I've had fire-practice."

"My business," said Trendon, briefly. "Decomposition; unpleasant, but not
dangerous."

Pushing the lantern before him, he wormed his way until the light was
blotted out. Presently it shone forth from the funnel, showing that the
explorer had reached the inner open space. Captain Parkinson dropped down
and peered in, but the evil odour was too much for him. He retired,
gagging and coughing. Trendon was gone for what seemed an interminable
time. His superior officer fidgeted uneasily. At last he could stand it no
longer.

"Dr. Trendon, are you all right?" he shouted.

"Yup," answered a choked voice. "Cubbing oud dow."

Again the funnel was darkened. A pair of feet appeared; then the surgeon's
chunky trunk, his head, and the lantern. Once, twice, and thrice he
inhaled deeply.

"Phew!" he gasped. "Thought I was tough, but--Phee-ee-ee-ew!"

"Did you find--"

"No, sir. Not Darrow. Only a poor devil of a seal that crawled in there to
die."

The exploration continued. Half a mile, as they estimated, from the open,
they reached a narrow beach, shut off by a perpendicular wall of rock.
Skirting this, they returned on the other side, minutely examining every
possible crevice. When they again reached the light of day, they had
arr