"Huerta's bird men might be able to give us a surprise like that,"

Trent suggested. "That may prove to be one of the new problems that we shall have to work out."

"Oh, I've worked that out already," yawned Danny Grin. "All we have to do is to equip our funnels with heavy iron caps that will not interfere with the draft of the furnaces, but will keep any oranges---bombs, I mean---from dropping down the funnels."

"All right then," added Lieutenant Trent. "We will consider Dalzell has solved the problem of keeping bombs out of our funnels. What is Dalzell going to do about contact bombs that might be dropped on deck or superstructure of a battleship?"

"All I can see for that," grinned Dan, "is to call loudly for the police."

"One biplane might succeed in sinking all the warships gathered at Vera Cruz," Trent continued.

"Was that the thought that made you look so happy when you came in here?" Dan asked, reproachfully. "The thought that you could scare two poor little ensigns so badly that they wouldn't be able to sleep to-night?"

"That was far from my plan," laughed Trent. "What I am really happy about is that, the way affairs are shaping, we shall soon be studying real war problems instead of theoretical ones."

"The question of uniform is bothering me more," Dave responded.

"Do you realize, Trent, that we have only blue uniforms and white ones on board? If we land, to capture Vera Cruz, are our men to be tortured in heavy, hot, blue uniforms here in the tropics?

Or are we to wear these white clothes and make ourselves the most perfect marks for the enemy's sharpshooters?"

"You should have more confidence in the men forward," half jeered the lieutenant. "Our jackies are taking care of that problem already. They are soaking nails and sc.r.a.p iron in water, and dyeing their white uniforms yellow with iron rust."

"Say, that is an idea!" exclaimed Dan, sitting bolt upright.

"I'm going to do that very thing to-night. I have one white uniform that isn't in very good shape."

"I suppose you fellows have heard the word?" inquired Lieutenant Holton, looking in.

"Not war?" asked Trent.

"No," uttered Holton, disgustedly. "Worse than that. Sh.o.r.e leave has been stopped for officers and men alike. And I was counting on a pleasant evening ash.o.r.e to-night!"

"It won't bother me any," Dave announced. "I'd rather stay on board and sleep against the stirring times, when we won't be able to get sleep enough."

"What's the idea, anyway, in stopping sh.o.r.e leave?" asked Trent.

"Is the admiral afraid that we'll start a row on sh.o.r.e?"

"I don't know," sighed Lieutenant Holton. "I only wish that I had got ash.o.r.e before the order was handed out."

At that very moment Lieutenant Cantor, who had returned to ship, and had just heard the order, was standing before Captain Gales in the latter's office.

"But, sir," stammered the young officer, "It is absolutely necessary that I go ash.o.r.e again to-morrow. It is vital to me, sir."

"I am sorry, Cantor," said Captain Gales, "but the admiral's orders leave me no discretion in the matter."

Captain Gales, as he spoke, turned his back in order to reach for a report book behind hum.

Ten minutes later Commander Bainbridge was summoned in hot haste to the Captain's office.

"Bainbridge," announced Captain Gales, his face stern and set, "at three o'clock a bulky envelope lay on my desk. That envelope contained the full plan of the Navy landing in Vera Cruz, in case such landing becomes necessary. All that we are to accomplish, and even the duties of the different officers and detachments from this fleet were stated in that letter. Not later than within the last half-hour that envelope has disappeared!"

Instantly Commander Bainbridge's face became grave indeed.

"Have you been out of the room, sir?" asked Bainbridge.

"Only once, and then, so the marine orderly at the door informs me, no one entered here."

"This is serious!" cried the executive officer."

"Serious?" repeated Captain Gales in a harsh tone. "I should say it was."

"Let us search the room thoroughly, sir," begged the executive officer.

Though no search could have been more thorough, the missing envelope was not found.

"Summon the officers---all of them---to meet me in the ward-room in five minutes!" rasped Captain Gales.

And there every officer of the "_Long Island_" reported immediately.

After the doors had been closed Captain Gales announced the loss.

Blank faces confronted him on all sides.

"Has any officer any information to offer that can throw the least light on thus matter?" demanded the Old Man, in a husky voice.

There was silence, broken at last by Lieutenant Cantor asking:

"May I make a suggestion, sir?"

"Certainly."

"How many officers, sir, visited your office after the time you are certain of having seen the missing envelope on your desk?"

"Five," replied Captain Gales. "Lieutenant-Commander Denton, Lieutenant-Commander Hansen, Lieutenant Holton, Lieutenant Trent and yourself."

"Were there any enlisted men in your office, sir?"

"None since before the letter came aboard," replied Captain Gales.

"Then I would beg to suggest, sir," Lieutenant Cantor continued, "that each of the five officers you have named, myself included, request that their quarters be thoroughly searched. If the missing envelope is not found in their quarters, then I would suggest that the quarters of every other officer on board be searched."

To this there was a low murmur of approval. The executive officer was instructed to take the chaplain, the surgeon and two other officers beside himself, these five to form the searching committee.

In the meantime, the officers were to remain in the ward-room or on the quarterdeck.

Dave, Dan and Trent seated themselves at the mess table. Time dragged by. At last the searching committee, looking grave indeed, returned.

"Is this the envelope, sir?" asked Commander Bainbridge, holding it out.

"It is," replied Captain Gales, scanning it. "But the envelope has now no contents."

"We found only the envelope, sir," replied Commander Bainbridge, while his four helpers looked uncomfortable. "We found the envelope tucked in a berth, under the mattress, in the quarters of an officer of this ship."

"And who was the officer in whose quarters you found it?" demanded Captain Gales.