"Whatever for?" asked Lionel in amazement.

"Do as you're told and don't ask questions," I replied rather crossly, for I was very anxious to try an experiment which I had in my mind. So we hauled the paper aboard and stretched it on the bulwarks to dry.

Then we hauled the broken bowsprit aboard and freed it from the broken ropes with our pen-knives—a long and difficult job—and by the time we had finished, the paper which had been around the box had become dry and quite stiff by reason of the gum with which it had been stuck to the sides of the box.

"Oh, I see!" cried Lionel, as I clambered on to the box (which was fastened by a rope to the side of the yacht) and began to cut a hole in the middle. "You're going to make a raft."

"I'm going to try to," I answered grimly, for I wasn't at all sure that my experiment would be a success.

By dint of real hard work, cutting and contriving, however, we did eventually succeed in making a raft of a sort, the stiff paper, fixed to the broken bowsprit, making a capital sail; and somewhat in fear and trembling, we both got aboard and pushed off from the derelict yacht.

All went well for some time till we were nearing the shore, and then I noticed something which caused me grave alarm.

We were both growing rapidly! The raft, which had before been quite large enough to support us, was now low down in the water with our weight, and there was great danger of the water getting into the inside of the box, in which case it would undoubtedly sink.

Lionel noticed the difficulty at the same time as myself, for he gave me a startled glance.

"We're getting bigger," he said. "Do you think the raft will hold out?"