Then, with her nose pointed toward Denver, the return trip began. Little worth mentioning occurred on it. Mr. Bentwell continued to improve and after a short stay in Denver, at the Montrose home, nearly all traces of his terrible year on the lonely island disappeared. Of course the story of the boys caused much comment, and they were regarded as heroes.

They received many offers for their radium, but they refused nearly all of them, giving a share of the stuff to Mr. Bentwell, some to Professor Snodgrass, and a portion to Mr. Montrose. The latter was interested in a Denver hospital that very much wanted some of the precious metal for medical purposes.

As for their portions the boys kept some for themselves for future use, and some they gave to the academy they attended. The rest they sold for a large sum.

Nothing more was heard from Noddy Nixon, save that he and Bill got safely home, after much hardship. As for the renegade professor he and Noddy quarreled, and separated.

“Let’s go all the way home by airship,” proposed Bob as they were about to leave Denver. “We can have the auto shipped to Cresville, and it’s much easier to get meals in the Comet than at hotels.”

“Bob, if you mention eating again, until we get home, we’ll put you on a bread and water diet,” threatened Ned, and Bob went off to the galley in a huff. But he was soon heard whistling as he made himself some sandwiches.

The airship trip was voted the best, and accordingly, it was undertaken. All went well, and in due time they were near their home town. At his request, Mr. Bentwell was allowed to leave the ship at a place where he could get a train to his home, for he did not want to take his new friends out of their way. He had telegraphed, at the first opportunity, to his relatives, telling them of his rescue. To say that they, and the world at large, were surprised by his wonderful story, is putting it mildly.

“Well, we got the radium treasure, after all,” remarked Jerry, one day a week or so later, when they were all assembled at his house.

“And I caught the two-tailed toad,” added the professor. “My college has conferred additional honors upon me for that. I am indeed a lucky individual.”

“I wonder what you’ll look for next?” spoke Bob.