“Here comes Dr. Preston!” added Bob, as he saw a young man, accompanied by a small throng of persons, racing toward the dock. “He’ll know what to do.”

Dr. Preston, who had been summoned by some one of the crowd who had witnessed the rescue, was soon working over Noddy.

“He’s out of danger now, though he’s not fully conscious yet,” said the doctor, after a few minutes. “It’s a wonder he had strength enough to hold on to the ring as you pulled him in.”

“Well, when Noddy gets hold of a thing, he hates to let go,” remarked Ned. “Say, fellows,” he added to his two chums, “a lot has happened since we started to talk about that radium deposit on Snake Island, in the Colorado canyon; hasn’t there?” he asked. “It seems like a week, but it hasn’t been half an hour.”

“That’s right,” agreed Bob. “I want to hear more about that radium. Let’s go back home, and the Professor can tell us. Noddy’s all right now. If we could go to Snake Island and get some radium——”

“Hush!” suddenly exclaimed Jerry, nudging his chum.

“What’s the matter?” demanded the stout youth.

“No use talking about that, where every one can hear you,” went on Jerry in a low voice. “Besides, Noddy is coming to, now. His eyes are open.”

The rescued lad was much better now, and was sitting up, held by the doctor, who was administering a stimulant.