"You'll soon be all right again now," comforted Tom. "Get a little salt horse and sea biscuit down for a foundation, and you can build up on that the finest thing in the way of a meal you ever saw."

For the first time since his illness Bob could think of food without a shudder. He really began to feel hungry. The old sailor proved a good prophet. Bob began to mend steadily, and in a few days he was as active as ever—more so, in fact.

"Now's the time to look for trouble," remarked Captain Spark to his mate one day.

"Trouble? How?"

"Bob is himself again. He'll be up to some tricks or I'm a Dutchman. But we must meet him half way. Give him back some of his own coin. He's on this voyage to be cured, and I'm going to do it If I have to keelhaul him."

"I guess the men will be only too anxious to do their share. They like Bob, but he mustn't play too many pranks on them."

"No. Well, I guess they can look out for themselves."

"I guess so," answered the mate with a smile. Later that day Captain Spark instructed Bob in some simple duties which would be his to perform during the voyage. He was to act in the capacity of cabin boy.

Now that Bob was in his usual spirits he began to feel an inclination to be at some of his pranks. He thought, with a sigh, that he had not played a good joke since the affair of the step-ladder, the cook and the hired man. So he began to look about and consider the possibilities of indulging in some pranks.

But Bob had about made up his mind not to bother the sailors. He was a little afraid of them, as they were big, strong men, and he had a suspicion that they were only waiting for him to begin operations before they would do something on their own account. Bob had an idea they might tie him to a rope, throw him overboard and duck him.