And, as their absence grew more and more protracted, the anxiety of boys and masters both had been very considerable.

Great was their satisfaction and relief when the storm-tossed boat came up to the jetty; Silver and a number of other seniors, who had been scouring the troubled waters in a launch, gave a cheer and helped them ashore.

Even old Salmon showed that there was a human being behind the dry pedagogic mask that he wore. "I'm glad you're safe, boys," he said, shaking them by the hand.

"Thank you, sir," answered Billy Faraday. "The storm came down very suddenly—we'd simply no chance of getting back. We were swamped, as it was. I'm afraid we broke bounds for once—we landed on Dog-face. Luckily, the boat and a couple of oars came ashore with us."

They were hurried up to the school, where they changed and imbibed generously of hot coffee, while a few privileged seniors and masters listened to the tale of their perilous trip. After which they went to their dormitory and to bed.

Jack Symonds lay awake long after the regular breathing of his companions indicated sleep. He was staring intently at an invisible ceiling, and remained so for quite a long time. He was ruminating over the various excitements of the day, and his mind seemed to dwell, for no apparent reason, on one detached incident—the discovery of that dark, smelly cave on Dog-face.

Somehow, his fancy was intrigued by the thought of that cave. He could not help feeling that there was some significance attached to it; he was aware that there was something—

"Jiminy!" The exclamation came so loudly, so sharply, that he feared he might have roused some of his pals. But they slumbered on. Two fellows were snoring on different notes, and their snores quarrelled comically; somebody groaned and turned over in his sleep; no other sounds could be heard.

Jack resumed his thoughts; that exclamation had betokened a discovery—light, in fact, was dawning on his mind. Now he could see what he had been thinking of. Ah! Of course ... Humbolt.

Was it a fact, he wondered, that "Tiger" was the occupant of the cave? The man, he knew, was lurking in the vicinity somewhere—what was more natural than that he should have selected the unknown hole, hidden away on deserted Dog-face, as his place of concealment?