"Unless he had a boat," said the captain. "But why doesn't he answer?"
"Better try again. No telling how much more there is of this."
The surgeon raised his ponderous bellow, and the cave roared 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."
