do," Barnes declared, "and that's one of them."

"If I thought I asked more foolish questions than you do, sir," Dan rejoined, laying down his coffee cup, "I'd—"

Here Dalzell paused.

"What would you do?" Barnes insisted.

"On second thought," Dan went on gravely, "I don't believe I'll tell you. It was something desperate that I was thinking of."

"Then drop the idea, Dalzell," scoffed Lieutenant Barnes lightly. "You're hardly the fellow we'd look to for desperate deeds."

"Oh, am I not?" demanded Dan, for once a bit miffed.

Several of the officers glanced up apprehensively. From necessity, life in the ward-room is an oppressively close one at best. A feud between two officers of the mess is enough to make all hands uncomfortable much of the time.

"Cut it, Barnes," ordered the officer sitting on the right-hand side of Lieutenant Barnes. "Don't start any argument."

"Gentlemen," broke in the paymaster, anxious to change the topic of conversation, "have you gone so far with your meal that a little bad news won't spoil your appetites?"

Most of those present nodded, smilingly.

"Then," continued the paymaster, "I wish to bring up a matter that has been discussed here before. You all know that in some way, owing to the carelessness of some one, there is an unexplained shortage of thirty-three dollars in our mess-fund. You appointed Totten and myself a committee to look into the matter. We now beg to report that the thirty-three dollars cannot be accounted for. What is your pleasure in the matter?"

"I would call it very simple," replied Lieutenant Commander Wales. "Why not levy an assessment upon the members of this mess sufficient to make up the thirty-three dollars? It will amount to very little apiece."

That way of remedying the shortage would have been agreed to promptly, had not Lieutenant Barnes cut in eagerly:

"I've a better plan for making up the shortage. One man can pay it all, as a penalty, and there will be a lot of fun in deciding which member has to pay the penalty."

"What's the idea, Mr. Barnes?" asked the executive officer.

"It's simple enough," Barnes went on, grinning. "Let us set apart the dinner hour on Tuesday evening, say. Every time this mess gets together we hear a lot of foolish questions asked. Now, on Tuesday evening, if any member of this mess asks a question that he can't answer himself, let it be agreed that he pay into the mess a fine of thirty-three dollars to cover the shortage."

"It won't work," objected Totten. "Every officer at this table will be on his guard not to ask any questions at all."

"In that case," proposed Barnes, "let the rule hold over on each successive Tuesday evening until the victim is found and has paid his fine."

"It sounds like sport," agreed Dave Darrin.

"It will be sport to see the victim 'stung' and made to pay up," grinned Dan Dalzell.

"And I think I know, already," contended Lieutenant Barnes, "which officer will pay that shortage."

"Are you looking at me with any particular significance?" demanded Danny Grin.

"I am," Barnes admitted.

"Oh, well, then, we shall see what we shall see," quoth Dalzell, his color rising.

The scheme for fixing the thirty-three-dollar penalty was quickly agreed upon. In fact, the plan had in it many of the exciting elements of a challenge.

Darrin left the mess to go on duty. Dan found him presently.

"Say," murmured Danny Grin, in an aside, "do you think Barnes will be very angry when he pays over that thirty-three dollars?"

"I haven't yet heard that he is to pay it," Dave answered quietly.

"But he is," Dalzell asserted.

"How's that?"

"I'm going to make it my business," Dan went on, "to see that Barnes is the victim of the very scheme that he proposed. He will ask a question that he can't answer, and he'll do it when Tuesday evening comes around."

"Don't be too sure of that," Dave warned him. "Barnes may not be exactly the most amiable officer aboard, but at least he's a very keen chap. If you are forming any plans for making Barnes pay, look out, Dan, that your scheme doesn't recoil upon yourself!"

"Wait and see," Dalzell insisted. "I tell you, Barnes is going to pay that thirty-three dollars into the mess treasury!"

CHAPTER III

THE STARTLER AT MONTE CARLO

The frowning crags of Monaco confronted the United States battleship "Hudson."

Here and there the rocky eminences were broken by tiny strips of white beach. In comparison with the crags the great, floating fighting machine looked like a pigmy, indeed.

It was toward evening, and the day was Tuesday. Darrin and Dalzell, both off duty for the time being, strolled along the battleship's quarter-deck, gazing shoreward.

"It's almost too bad that the times are so civilized," murmured Danny Grin. "That little toy principality would make an ideal pirates' nest."

"I fancy Monaco has done duty enough in that line in the past centuries," smiled Darrin. "I have been reading up a bit on the history of Monaco. Piracy flourished here as late as the fourteenth century. Even rather late in the eighteenth century every ship passing close to this port had to pay toll. And to-day, through its vast gambling establishments, visited by thousands every week, Monaco reaches out and still takes its toll from all the world."

"It won't take any from me," smiled Dalzell.

"That is because you're a disciplined human being, and you've too much character and honesty to gamble," Darrin went on. "But think, with a pitying sigh, of the thousands of poor wretches who journey to Monaco, enter the Casino at Monte Carlo, part with their money and their honor, and then pass into one of the gardens, there to blow their brains out.

"We shall get a glimpse of the place to-night," Dave continued. "I will admit that I have a good deal of curiosity to see it. So I am glad that we have shore leave effective after dinner. Still, we shan't see anything like the crowd or the picture that we might see if Europe were at peace."

"This is Tuesday night," Dan warned his chum.

"Yes; the night to avoid dangerous questions at mess," Dave smiled. "Dan, are you still going to try to catch Barnes?"

"Watch me," winked Dalzell.

"Look out, Dan! Such a trap may be set at both ends."

But Dalzell winked once more, then allowed his mouth to expand in that contortion which had won him the nick name of "Danny Grin."

Dave soon forgot Dalzell's threat of trouble for the evening. It had passed out of his mind by the time that Ensign Darrin entered the ward-room. Yet soon after the officers had seated themselves the executive officer announced:

"In the interest of fair play to all I deem it best to warn you, gentlemen, that to-night is the night when the first gentleman who asks a question that he cannot himself answer is liable to a penalty of thirty-three dollars to make up the deficit in the mess treasury."

There were nods and grins, and shakings of heads. Not an officer present had any idea that he could be caught and made to pay the penalty.

As the meal progressed Lieutenant Commander Wales finally turned to one of the Filipino waiters and inquired:

"Is there any of the rare roast beef left?"

"Don't you know yourself, Wales?" demanded Totten quickly.

"Why, er—no-o," admitted Mr. Wales, looking much puzzled. "Why should I?"

"Then haven't you asked a question that you can't answer?" demanded Totten mischievously.

"That's hardly a fair catch, is it?" demanded the navigating